Tag Archives: galaxy

Webb offers never-before-seen details of early universe, distant galaxy MACS0647-JD

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NASA’s James Webb Space Telescope was specially designed to detect the faint infrared light from very distant galaxies and give astronomers a glimpse at the early universe. The nature of galaxies during this early period of our universe is not well known nor understood. But with the help of gravitational lensing by a cluster of galaxies in the foreground, faint background galaxies can be magnified and also appear multiple times in different parts of the image.

Today, we sit down with three astronomers working on Webb to talk about their latest findings. The team members are Dan Coe of AURA/STScI for the European Space Agency and the Johns Hopkins University; Tiger Hsiao of the Johns Hopkins University; and Rebecca Larson of the University of Texas at Austin. These scientists have been observing the distant galaxy MACS0647-JD with Webb, and they’ve found something interesting.

The massive gravity of galaxy cluster MACS0647

Dan Coe: I discovered this galaxy MACS0647-JD 10 years ago with the Hubble Space Telescope. At the time, I’d never worked on high redshift galaxies, and then I found this one that was potentially the most distant at redshift 11, about 97 percent of the way back to the big bang. With Hubble, it was just this pale, red dot. We could tell it was really small, just a tiny galaxy in the first 400 million years of the universe. Now we look with Webb, and we’re able to resolve TWO objects! We’re actively discussing whether these are two galaxies or two clumps of stars within a galaxy. We don’t know, but these are the questions that Webb is designed to help us answer.

Tiger Yu-Yang Hsiao: You can also see that the colors between the two objects are so different. One’s bluer; the other one is redder. The blue gas and the red gas have different characteristics. The blue one actually has very young star formation and almost no dust, but the small, red object has more dust inside, and is older. And their stellar masses are also probably different.

It’s really interesting that we see two structures in such a small system. We might be witnessing a galaxy merger in the very early universe. If this is the most distant merger, I will be really ecstatic!

Dan Coe: Due to the gravitational lensing of the massive galaxy cluster MACS0647, it’s lensed into three images: JD1, JD2, and JD3. They’re magnified by factors of eight, five, and two, respectively.

Rebecca Larson: Up to this point, we haven’t really been able to study galaxies in the early universe in great detail. We had only tens of them prior to Webb. Studying them can help us understand how they evolved into the ones like the galaxy we live in today. And also, how the universe evolved throughout time.

The U.S. Postal Service will issue a stamp highlighting NASA’s James Webb Space Telescope on Sept. 8, 2022. U.S. Postal Service Art Director Derry Noyes designed the stamp using existing art by James Vaughan and an image provided by NASA and the Space Telescope Science Institute.
Credits: U.S. Postal Service

I think my favorite part is, for so many new Webb image we get, if you look in the background, there are all these little dots—and those are all galaxies! Every single one of them. It’s amazing the amount of information that we’re getting that we just weren’t able to see before. And this is not a deep field. This is not a long exposure. We haven’t even really tried to use this telescope to look at one spot for a long time. This is just the beginning!

The James Webb Space Telescope is the world’s largest, most powerful, and most complex space science telescope ever built. Webb will solve mysteries in our solar system, look beyond to distant worlds around other stars, and probe the mysterious structures and origins of our universe and our place in it.

NASA: Are you in an area of Lucy then take a photograph, post it to social media

NASA’s Swift, Fermi missions detect exceptional cosmic blast

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Astronomers around the world are captivated by an unusually bright and long-lasting pulse of high-energy radiation that swept over Earth Sunday, Oct. 9. The emission came from a gamma-ray burst (GRB) – the most powerful class of explosions in the universe – that ranks among the most luminous events known.

On Sunday morning Eastern time, a wave of X-rays and gamma rays passed through the solar system, triggering detectors aboard NASA’s Fermi Gamma-ray Space Telescope, Neil Gehrels Swift Observatory, and Wind spacecraft, as well as others. Telescopes around the world turned to the site to study the aftermath, and new observations continue.

Called GRB 221009A, the explosion provided an unexpectedly exciting start to the 10th Fermi Symposium, a gathering of gamma-ray astronomers now underway in Johannesburg, South Africa. “It’s safe to say this meeting really kicked off with a bang – everyone’s talking about this,” said Judy Racusin, a Fermi deputy project scientist at NASA’s Goddard Space Flight Center in Greenbelt, Maryland, who is attending the conference.


Swift’s X-Ray Telescope captured the afterglow of GRB 221009A about an hour after it was first detected. The bright rings form as a result of X-rays scattered from otherwise unobservable dust layers within our galaxy that lie in the direction of the burst./Credit: NASA/Swift/A. Beardmore (University of Leicester)

The signal, originating from the direction of the constellation Sagitta, had traveled an estimated 1.9 billion years to reach Earth. Astronomers think it represents the birth cry of a new black hole, one that formed in the heart of a massive star collapsing under its own weight. In these circumstances, a nascent black hole drives powerful jets of particles traveling near the speed of light. The jets pierce through the star, emitting X-rays and gamma rays as they stream into space.

The light from this ancient explosion brings with it new insights into stellar collapse, the birth of a black hole, the behavior and interaction of matter near the speed of light, the conditions in a distant galaxy – and much more. Another GRB this bright may not appear for decades.

According to a preliminary analysis, Fermi’s Large Area Telescope (LAT) detected the burst for more than 10 hours. One reason for the burst’s brightness and longevity is that, for a GRB, it lies relatively close to us.

NASA

“This burst is much closer than typical GRBs, which is exciting because it allows us to detect many details that otherwise would be too faint to see,” said Roberta Pillera, a Fermi LAT Collaboration member who led initial communications about the burst and a doctoral student at the Polytechnic University of Bari, Italy. “But it’s also among the most energetic and luminous bursts ever seen regardless of distance, making it doubly exciting.”

The burst also provided a long-awaited inaugural observing opportunity for a link between two experiments on the International Space Station – NASA’s NICER X-ray telescope and a Japanese detector called the Monitor of All-sky X-ray Image (MAXI). Activated in April, the connection is dubbed the Orbiting High-energy Monitor Alert Network (OHMAN). It allows NICER to rapidly turn to outbursts detected by MAXI, actions that previously required intervention by scientists on the ground.

“OHMAN provided an automated alert that enabled NICER to follow up within three hours, as soon as the source became visible to the telescope,” said Zaven Arzoumanian, the NICER science lead at Goddard. “Future opportunities could result in response times of a few minutes.”

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Astronomers Detect Protective Shield Defending Pair of ‘Dwarf Galaxies’ with help of FUSE, Hubble

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For billions of years, the Milky Way’s largest satellite galaxies – the Large and Small Magellanic Clouds – have followed a perilous journey. Orbiting one another as they are pulled in toward our home galaxy, they have begun to unravel, leaving behind trails of gaseous debris. And yet – to the puzzlement of astronomers – these dwarf galaxies remain intact, with ongoing vigorous star formation.

“A lot of people were struggling to explain how these streams of material could be there,” said Dhanesh Krishnarao, assistant professor at Colorado College. “If this gas was removed from these galaxies, how are they still forming stars?”

With the help of data from NASA’s Hubble Space Telescope and a retired satellite called the Far Ultraviolet Spectroscopic Explorer (FUSE), a team of astronomers led by Krishnarao has finally found the answer: the Magellanic system is surrounded by a corona, a protective shield of hot supercharged gas. This cocoons the two galaxies, preventing their gas supplies from being siphoned off by the Milky Way, and therefore allowing them to continue forming new stars.

Description of the above image:

Researchers have used spectroscopic observations of ultraviolet light from quasars to detect and map out the Magellanic Corona, a diffuse halo of hot, supercharged gas surrounding the Small and Large Magellanic Clouds. Shown here in purple, the corona stretches more than 100,000 light-years from the main mass of stars, gas, and dust that make up the Magellanic Clouds, intermingling with the hotter and more extensive corona that surrounds the Milky Way. The Magellanic Clouds, dwarf galaxies roughly 160,000 light-years from Earth, are the largest of the Milky Way’s satellites and are thought to be on their first in-falling passage around the Milky Way. This journey has begun to unravel what were once barred spirals with multiple arms into more irregular-shaped galaxies with long tails of debris. The corona is thought to act as a buffer protecting the dwarf galaxies’ vital star-forming gas from the gravitational pull of the much larger Milky Way. The detection of the Magellanic Corona was made by analyzing patterns in ultraviolet light from 28 distant background quasars. As the quasar light passes through the corona, certain wavelengths (colors) of ultraviolet light are absorbed. The quasar spectra become imprinted with the distinct signatures of carbon, oxygen, and silicon ions that make up the corona gas. Because each quasar probes a different part of the corona, the research team was also able to show that the amount of gas decreases with distance from the center of the Large Magellanic Cloud. This study used archival observations of quasars from Hubble’s Cosmic Origins Spectrograph (COS) and the Far Ultraviolet Spectroscopic Explorer (FUSE). Quasars have also been used to probe the Magellanic Stream, outflows from the Milky Way , and the halo surrounding the Andromeda Galaxy./Illustration Credits: STScI, Leah Hustak

 

This discovery, which was just published in Nature, addresses a novel aspect of galaxy evolution. “Galaxies envelope themselves in gaseous cocoons, which act as defensive shields against other galaxies,” said co-investigator Andrew Fox of the Space Telescope Science Institute in Baltimore, Maryland.

Astronomers predicted the corona’s existence several years ago. “We discovered that if we included a corona in the simulations of the Magellanic Clouds falling onto the Milky Way, we could explain the mass of extracted gas for the first time,” explained Elena D’Onghia, a co-investigator at the University of Wisconsin–Madison. “We knew that the Large Magellanic Cloud should be massive enough to have a corona.”

But although the corona stretches more than 100,000 light-years from the Magellanic clouds and covers a huge portion of the southern sky, it is effectively invisible. Mapping it out required scouring through 30 years of archived data for suitable measurements.

Researchers think that a galaxy’s corona is a remnant of the primordial cloud of gas that collapsed to form the galaxy billions of years ago. Although coronas have been seen around more distant dwarf galaxies, astronomers had never before been able to probe one in as much detail as this.

There’re lots of predictions from computer simulations about what they should look like, how they should interact over billions of years, but observationally we can’t really test most of them because dwarf galaxies are typically just too hard to detect,” said Krishnarao. Because they are right on our doorstep, the Magellanic Clouds provide an ideal opportunity to study how dwarf galaxies interact and evolve.

In search of direct evidence of the Magellanic Corona, the team combed through the Hubble and FUSE archives for ultraviolet observations of quasars located billions of light-years behind it. Quasars are the extremely bright cores of galaxies harboring massive active black holes. The team reasoned that although the corona would be too dim to see on its own, it should be visible as a sort of fog obscuring and absorbing distinct patterns of bright light from quasars in the background. Hubble observations of quasars were used in the past to map the corona surrounding the Andromeda galaxy.

By analyzing patterns in ultraviolet light from 28 quasars, the team was able to detect and characterize the material surrounding the Large Magellanic Cloud and confirm that the corona exists. As predicted, the quasar spectra are imprinted with the distinct signatures of carbon, oxygen, and silicon that make up the halo of hot plasma that surrounds the galaxy.

The ability to detect the corona required extremely detailed ultraviolet spectra. “The resolution of Hubble and FUSE were crucial for this study,” explained Krishnarao. “The corona gas is so diffuse, it’s barely even there.” In addition, it is mixed with other gases, including the streams pulled from the Magellanic Clouds and material originating in the Milky Way.

By mapping the results, the team also discovered that the amount of gas decreases with distance from the center of the Large Magellanic Cloud. “It’s a perfect telltale signature that this corona is really there,” said Krishnarao. “It really is cocooning the galaxy and protecting it.”

How can such a thin shroud of gas protect a galaxy from destruction?

“Anything that tries to pass into the galaxy has to pass through this material first, so it can absorb some of that impact,” explained Krishnarao. “In addition, the corona is the first material that can be extracted. While giving up a little bit of the corona, you’re protecting the gas that’s inside of the galaxy itself and able to form new stars.”

Webb space Telescope Captures Clearest View of Neptune’s Rings, Unusual Moon ‘Triton’

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NASA’s James Webb Space Telescope shows off its capabilities closer to home with its first image of Neptune. Not only has Webb captured the clearest view of this distant planet’s rings in more than 30 years, but its cameras reveal the ice giant in a whole new light.

Most striking in Webb’s new image is the crisp view of the planet’s rings – some of which have not been detected since NASA’s Voyager 2 became the first spacecraft to observe Neptune during its flyby in 1989. In addition to several bright, narrow rings, the Webb image clearly shows Neptune’s fainter dust bands.

“It has been three decades since we last saw these faint, dusty rings, and this is the first time we’ve seen them in the infrared,” notes Heidi Hammel, a Neptune system expert and interdisciplinary scientist for Webb. Webb’s extremely stable and precise image quality permits these very faint rings to be detected so close to Neptune.

Neptune has fascinated researchers since its discovery in 1846. Located 30 times farther from the Sun than Earth, Neptune orbits in the remote, dark region of the outer solar system. At that extreme distance, the Sun is so small and faint that high noon on Neptune is similar to a dim twilight on Earth.

Webb’s Near-Infrared Camera (NIRCam) images objects in the near-infrared range from 0.6 to 5 microns, so Neptune does not appear blue to Webb. In fact, the methane gas so strongly absorbs red and infrared light that the planet is quite dark at these near-infrared wavelengths, except where high-altitude clouds are present. Such methane-ice clouds are prominent as bright streaks and spots, which reflect sunlight before it is absorbed by methane gas.
Credits: NASA, ESA, CSA, STScI

This planet is characterized as an ice giant due to the chemical make-up of its interior. Compared to the gas giants, Jupiter and Saturn, Neptune is much richer in elements heavier than hydrogen and helium. This is readily apparent in Neptune’s signature blue appearance in Hubble Space Telescope images at visible wavelengths, caused by small amounts of gaseous methane.

Webb’s Near-Infrared Camera (NIRCam) images objects in the near-infrared range from 0.6 to 5 microns, so Neptune does not appear blue to Webb. In fact, the methane gas so strongly absorbs red and infrared light that the planet is quite dark at these near-infrared wavelengths, except where high-altitude clouds are present. Such methane-ice clouds are prominent as bright streaks and spots, which reflect sunlight before it is absorbed by methane gas. Images from other observatories, including the Hubble Space Telescope and the W.M. Keck Observatory, have recorded these rapidly evolving cloud features over the years.

More subtly, a thin line of brightness circling the planet’s equator could be a visual signature of global atmospheric circulation that powers Neptune’s winds and storms. The atmosphere descends and warms at the equator, and thus glows at infrared wavelengths more than the surrounding, cooler gases.

Neptune’s 164-year orbit means its northern pole, at the top of this image, is just out of view for astronomers, but the Webb images hint at an intriguing brightness in that area. A previously-known vortex at the southern pole is evident in Webb’s view, but for the first time Webb has revealed a continuous band of high-latitude clouds surrounding it.

What do we see in Webb’s latest image of the ice giant Neptune? Webb captured seven of Neptune’s 14 known moons: Galatea, Naiad, Thalassa, Despina, Proteus, Larissa, and Triton. Neptune’s large and unusual moon, Triton, dominates this Webb portrait of Neptune as a very bright point of light sporting the signature diffraction spikes seen in many of Webb’s images.
Credits: NASA, ESA, CSA, STScI

Webb also captured seven of Neptune’s 14 known moons. Dominating this Webb portrait of Neptune is a very bright point of light sporting the signature diffraction spikes seen in many of Webb’s images, but this is not a star. Rather, this is Neptune’s large and unusual moon, Triton.

Covered in a frozen sheen of condensed nitrogen, Triton reflects an average of 70 percent of the sunlight that hits it. It far outshines Neptune in this image because the planet’s atmosphere is darkened by methane absorption at these near-infrared wavelengths. Triton orbits Neptune in an unusual backward (retrograde) orbit, leading astronomers to speculate that this moon was originally a Kuiper belt object that was gravitationally captured by Neptune. Additional Webb studies of both Triton and Neptune are planned in the coming year.

 

 

Artemis I Launch Update: Teams Replace Seals on Artemis I Moon Rocket, Prepare for Tanking Test

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After disconnecting the ground and rocket-side plates on the interface, called a quick disconnect, for the liquid hydrogen fuel feed line, teams have replaced the seals on the Space Launch System rocket’s core stage associated with the liquid hydrogen leak detected during the Artemis I launch attempt Sept. 3. 

Both the 8-inch line used to fill and drain liquid hydrogen from the core stage and the 4-inch bleed line used to redirect some of the propellant during tanking operations were removed and replaced this week.  

NASA’s Space Launch System (SLS) rocket is seen at Launch Pad 39B Thursday, Sept. 8, 2022, at NASA’s Kennedy Space Center in Florida as teams work to replace the seal on an interface, called the quick disconnect, between the liquid hydrogen fuel feed line on the mobile launcher and the rocket. Photo Credit: (NASA/Chad Siwik)

Coming up, technicians will reconnect the umbilical plates and perform inspections over the weekend before preparing for a tanking demonstration as soon as Saturday, Sept. 17. This demonstration will allow engineers to check the new seals under cryogenic, or supercold, conditions as expected on launch day and before proceeding to the next launch attempt.  

NASA/Photo: Nasa.gov

During the operation, teams will practice loading liquid hydrogen and liquid oxygen in the rocket’s core stage and interim cryogenic propulsion stage and getting to a stable replenish state for both propellants.

Teams will confirm the leak has been repaired and also perform the kick-start bleed test and a pre-pressurization test, which will validate the ground and flight hardware and software systems can perform the necessary functions required to thermally condition the engines for flight.  Following the test, teams will evaluate the data along with plans for the next launch opportunity. 

 Artemis I Launch Update: Repair Work Underway, Preparations Continue for Next Launch

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Engineers are making progress repairing the area where a liquid hydrogen leak was detected during the Artemis I launch attempt Sept. 3, and NASA is preserving options for the next launch opportunity as early as Friday, Sept. 23. 

Technicians constructed a tent-like enclosure around the work area to protect the hardware and teams from weather and other environmental conditions at Launch Pad 39B. They have disconnected the ground- and rocket-side plates on the interface, called a quick disconnect, for the liquid hydrogen fuel feed line, performed initial inspections, and began replacing two seals – one surrounding the 8-inch line used to fill and drain liquid hydrogen from the core stage, and another surrounding the 4-inch bleed line used to redirect some of the propellant during tanking operations. The SLS rocket and Orion spacecraft are in good condition while remaining at the launch pad. 

Once the work is complete, engineers will reconnect the plates and perform initial tests to evaluate the new seals. Teams will check the new seals under cryogenic, or supercold, conditions no earlier than Sept. 17 in which the rocket’s core stage and interim cryogenic propulsion stage will be loaded with liquid oxygen and liquid hydrogen to validate the repair under the conditions it would experience on launch day. Engineers are in the process of developing a full plan for the checkouts. 

Artemis I logo/NASA

NASA has submitted a request to the Eastern Range for an extension of the current testing requirement for the flight termination system. NASA is respecting the range’s processes for review of the request, and the agency continues to provide detailed information to support a range decision.  

In the meantime, NASA is instructing the Artemis team to move forward with all preparations required for testing, followed by launch, including preparations to ensure adequate supplies of propellants and gases used in tanking operations, as well as flight operations planning for the mission. NASA has requested the following launch opportunities: 

  • Sept 23: Two-hour launch window opens at 6:47 a.m. EDT; landing on Oct. 18 
  • Sept. 27: 70-minute launch window opens at 11:37 a.m.; landing on Nov. 5 

NASA’s teams internally are preparing to support additional dates in the event flexibility is required. The agency will evaluate and adjust launch opportunities and alternate dates based on progress at the pad and to align with other planned activities, including DART’s planned impact with an asteroid, the west coast launch of a government payload, and the launch of Crew-5 to the International Space Station. 

NASA/Photo: Nasa.gov

Listen to a replay of today’s media teleconference on the status of the Artemis I mission. Artemis I is an uncrewed flight test to provide a foundation for human exploration in deep space and demonstrate our commitment and capability to extend human existence to the Moon and beyond.  

NASA Hosts National Space Council Meeting, Vice President Kamala Harris Chairs Event

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Vice President Kamala Harris highlighted the importance of climate, human spaceflight, and STEM education during the Biden-Harris Administration’s second National Space Council meeting Friday, held at NASA’s Johnson Space Center in Houston.

“For generations, with our allies and partners around the globe, America has led our world in the exploration and use of space,” said Harris. “Our leadership has been guided by a set of fundamental principles – cooperation, security, ambition, and public trust – which is the recognition, of course, that space can and must be protected for the benefit of all people.

There is so much we still don’t know and so much we still haven’t done – space remains a place of undiscovered and unrealized opportunity. Our test and our responsibility is to work together to guide humanity forward into this new frontier and to make real the incredible potential of space for all people.”

National Space Council Meeting led by Chairwoman, Vice President Kamala Harris. Photo Date: September 9, 2022. Location: Building 9NW, SVMF. Photographer: Robert Markowitz.

For more than 50 years, NASA satellites have provided open-source and publicly available data on Earth’s land, water, temperature, weather, and climate. Improving access to key climate information is a priority for the agency. Building on his previous announcement, NASA Administrator Bill Nelson released the first concept, and shared a new video for the Earth Information Center. The center will allow the public to see how the Earth is changing and guide decision makers to mitigate, adapt, and respond to climate change.

“Just like we use mission control to monitor operations during spaceflight, we’re embarking on this effort to monitor conditions here on our home planet, and it will be available to everyone in an easy-to-access format,” Nelson said.

Planning for the Earth Information Center is underway with the initial phase providing an interactive visual display of imagery and data from NASA and other government agencies. NASA Headquarters plans to house this initial interactive display with goals to expand in person and virtual access over the next five years.

The Vice President also underscored the important research conducted on the International Space Station that will enable long duration stays on the Moon and future human missions to Mars, in addition to benefits to life here on Earth.

NASA/Photo: Nasa.gov

“NASA uses the International Space Station to conduct critical research on the risks associated with future Mars missions – space radiation, isolation, and distance from Earth, just to name a few. It’s also a testbed to develop the technologies we’ll need for long duration stays on the Moon, where we will build an Artemis Base Camp on the surface and Gateway outpost in lunar orbit,” Nelson said. “Research on the space station demonstrates that the benefits of microgravity are not just for discovery. We also develop new technologies that improve life on Earth, like treatments for cancer.”

In conjunction with the meeting, NASA announced a new Space Grant K-12 Inclusiveness and Diversity in STEM (SG KIDS) opportunity that will award more than $4 million to institutions across the U.S. to help bring the excitement of NASA and STEM to traditionally underserved and underrepresented groups of middle and high school students. The announcement is a part of a broader set of commitments made by public, private, and philanthropic partners announced by the Vice President to help in the recruitment and development of the next generation of the space workforce.

SG KIDS also addresses the White House Executive Order on Advancing Racial Equity and Support for Underserved Communities Through the Federal Government, as well as NASA Administrator Bill Nelson’s focus on providing authentic STEM opportunities to K-12 students.

While at NASA’s Johnson Space Center, Vice President Harris toured the agency’s mission control with Nelson and Johnson Center Director Vanessa Wyche. The Vice President also spoke with NASA astronauts Bob Hines, Kjell Lindgren, and Jessica Watkins, living and working aboard the International Space Station about how their research benefits life on Earth, supports long duration space flight, and protects our planet.

The Vice President also received a tour of the Space Vehicle Mockup Facility (SVMF), where space flight crews and their support personnel receive world class training on high-fidelity hardware for real-time mission support. The SVMF consists of space station, Orion, Commercial vehicle mockups, part-task trainers and rack interfaces, a Precision Air Bearing Floor, and a Partial Gravity Simulator.

A recording of the full National Space Council meeting is available online at:

https://go.nasa.gov/3eEGxEW

US Postal Service Celebrates NASA’s Webb Telescope With New Postal Stamp

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The U.S. Postal Service will issue a stamp celebrating NASA’s new James Webb Space Telescope, the largest, most powerful, and most complex science telescope ever put in space. The stamp, which features an illustration of the observatory, will be dedicated in a ceremony Thursday, Sept. 8, at the Smithsonian’s National Postal Museum in Washington.

“When anyone who uses these stamps looks at this telescope, I want them to see what I see: its incredible potential to reveal new and unexpected discoveries that help us understand the origins of the universe, and our place in it,” said NASA Associate Administrator Bob Cabana. “This telescope is the largest international space science program in U.S. history, and I can’t wait to see the scientific breakthroughs it will enable in astronomy.”

Webb, a mission led by NASA in partnership with ESA (European Space Agency) and CSA (Canadian Space Agency), launched Dec. 25, 2021, from Europe’s Spaceport in French Guiana. Over the following months, Webb traveled to its destination nearly one million miles (1.5 million kilometers) away from Earth, underwent weeks of complex deployments to unfold into its final configuration, and prepared its mirrors and science instruments to capture never-before-seen views of the universe.

The U.S. Postal Service will issue a stamp highlighting NASA’s James Webb Space Telescope on Sept. 8, 2022. U.S. Postal Service Art Director Derry Noyes designed the stamp using existing art by James Vaughan and an image provided by NASA and the Space Telescope Science Institute.
Credits: U.S. Postal Service

NASA released Webb’s first full-color images and spectra July 12 – providing a first look at the observatory’s powerful capabilities. The U.S. Postal Service stamp honors these achievements as Webb continues its mission to explore the unknown in our universe and study every phase in cosmic history.

“I am excited to add this beautiful stamp to our collection, as we watch from the ground as humanity’s newest and most capable telescope unlocks the greatest secrets of our cosmos that have been waiting to be revealed since the beginning of time,” said Thomas Zurbuchen, associate administrator for NASA’s Science Mission Directorate. “The Webb Telescope represents the start to a new era of what we can accomplish for the benefit of all.”

The stamp features an artist’s digital illustration of Webb against a background of stars. The selvage around each set of stamps showcases a sharp image of a star, captured while setting up the telescope in space to confirm precise alignment of Webb’s 18 hexagonal mirror segments.

The U.S. Postal Service’s first day of issue event is free and open to the public on Thursday, Sept. 8, at 11 a.m. EDT at the National Postal Museum. NASA Associate Administrator Bob Cabana; Lee Feinberg, Webb optical telescope element manager at NASA’s Goddard Space Flight Center; and Erin Smith, Webb deputy observatory project scientist at NASA Goddard will be among the speakers providing remarks.

NASA/Photo: Nasa.gov

To follow along with NASA’s Webb Telescope as it begins its mission to unfold the infrared universe, visit:

https://www.nasa.gov/webb

The James Webb Space Telescope is the world’s premier infrared space science observatory. Webb will solve mysteries in our solar system, look beyond to distant worlds around other stars, and probe the mysterious structures and origins of our universe and our place in it. Webb is an international program led by NASA with its partners, ESA (European Space Agency) and CSA (Canadian Space Agency).

30 Doradus: Thousands of stunning young stars in “cosmic tarantula”captured by James Webb telescope

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Thousands of never-before-seen young stars spotted in a stellar nursery called 30 Doradus, captured by NASA’s James Webb Space Telescope, called Tarantula Nebula owing to its appearance in dusty filaments.

The nebula has long been a favorite for astronomers studying star formation and the  Webb has been revealing beautiful distant background galaxies, as well as the detailed structure and composition of the nebula’s gas and dust ever since it’s started capturing the deep space.

At only 161,000 light-years away in the Large Magellanic Cloud galaxy, the Tarantula Nebula is the largest and brightest star-forming region in the Local Group, the galaxies nearest our Milky Way. It is home to the hottest, most massive stars known. Astronomers focused three of Webb’s high-resolution infrared instruments on the Tarantula. Under the lens of Webb’s Near-Infrared Camera (NIRCam), the region resembles a burrowing tarantula’s home, lined with its silk.

The nebula’s cavity centered in the image above has been hollowed out by blistering radiation from a cluster of massive young stars, which sparkle pale blue in the image. Only the densest surrounding areas of the nebula resist erosion by these stars’ powerful stellar winds, forming pillars that appear to point back toward the cluster. These pillars contain forming protostars, which will eventually emerge from their dusty cocoons and take their turn shaping the nebula.

Caption: Nestled in the center of the Tarantula Nebula in the Large Magellanic Cloud is the largest star yet discovered, astronomers have produced the sharpest image ever of this star.  Photo:Observatory/NOIRLab/NSF/AURA Acknowledgment

Webb’s Near-Infrared Spectrograph (NIRSpec) caught one very young star doing precisely emerging out of the dust. Astronomers previously thought this star might be a bit older and already in the process of clearing out a bubble around itself. However, NIRSpec showed that the star was only just beginning to emerge from its pillar and still maintained an insulating cloud of dust around itself. Without Webb’s high-resolution spectra at infrared wavelengths, this episode of star formation-in-action could not have been revealed.

The region takes on a different appearance when viewed in the longer infrared wavelengths detected by Webb’s Mid-infrared Instrument (MIRI). The hot stars fade, and the cooler gas and dust glow. Within the stellar nursery clouds, points of light indicate embedded protostars, still gaining mass.

While shorter wavelengths of light are absorbed or scattered by dust grains in the nebula, and therefore never reach Webb to be detected, longer mid-infrared wavelengths penetrate that dust, ultimately revealing a previously unseen cosmic environment.

Caption: NASA’s James Webb Space Telescope

One of the reasons the Tarantula Nebula is interesting to astronomers is that the nebula has a similar type of chemical composition as the gigantic star-forming regions observed at the universe’s “cosmic noon,” when the cosmos was only a few billion years old and star formation was at its peak. Star-forming regions in our Milky Way galaxy are not producing stars at the same furious rate as the Tarantula Nebula, and have a different chemical composition.

Caption: In this mosaic image displays the Tarantula Nebula star, including tens of thousands of never-before-seen young stars that were previously shrouded in cosmic dust. The most active region appears to sparkle with massive young stars, appearing pale blue./Photo:NASA

This makes the Tarantula the closest (i.e., easiest to see in detail) example of what was happening in the universe as it reached its brilliant high noon. Webb will provide astronomers the opportunity to compare and contrast observations of star formation in the Tarantula Nebula with the telescope’s deep observations of distant galaxies from the actual era of cosmic noon.

 

 

 

 

 

 

First underground radar images from Mars Perseverance rover reveal some surprises

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Key takeaways:

  • Roving the Red Planet. Perseverance landed on Mars in February 2021 and has been gathering data on the planet’s geology and climate and searching for signs of ancient life.​​​​​​
  • What lies beneath. The rover’s subsurface radar experiment, co-led by UCLA’s David Paige, has returned images showing unexpected variations in rock layers beneath the Jezero crater.
  • Probing the past. The variations could indicate past lava flows or possibly a river delta even older than the one currently being explored on the crater floor.

After a tantalizing year-and-a-half wait since NASA’s Mars Perseverance rover touched down on our nearest planetary neighbor, new data is arriving — and bringing with it a few surprises.

The rover, which is about the size of car and carries seven scientific instruments, has been probing Mars’ 30-mile-wide Jezero crater, once the site of a lake and an ideal spot to search for evidence of ancient life and information about the planet’s geological and climatic past.

Rendering of Perseverance, whose RIMFAX technology is exploring what lies beneath the Martian surface. Photo: NASA/JPL/Caltech/FFI

In a paper published today in the journal Science Advances, a research team led by UCLA and the University of Oslo reveals that rock layers beneath the crater’s floor, observed by the rover’s ground-penetrating radar instrument, are unexpectedly inclined. The slopes, thicknesses and shapes of the inclined sections suggest they were either formed by slowly cooling lava or deposited as sediments in the former lake.

Perseverance is currently exploring a delta on the western edge of the crater, where a river once fed the lake, leaving behind a large deposit of dirt and rocks it picked up along its course. As the rover gathers more data, the researchers hope to clear up the complex history of this part of the Red Planet.

“We were quite surprised to find rocks stacked up at an inclined angle,” said David Paige, a UCLA professor of Earth, planetary and space sciences and one of the lead researchers on the Radar Imager for Mars Subsurface Experiment, or RIMFAX. “We were expecting to see horizontal rocks on the crater floor. The fact that they are tilted like this requires a more complex geologic history. They could have been formed when molten rock rose up towards the surface, or, alternatively, they could represent an older delta deposit buried in the crater floor.”

Paige said that most of the evidence gathered by the rover so far points to an igneous, or molten, origin, but based on the RIMFAX data, he and the team can’t yet say for certain how the inclined layers formed. RIMFAX obtains a picture of underground features by sending bursts of radar waves below the surface, which are reflected by rock layers and other obstacles. The shapes, densities, thicknesses, angles and compositions of underground objects affect how the radar waves bounce back, creating a visual image of what lies beneath.

During Perseverance’s initial 3-kilometer traverse, the instrument has obtained a continuous radar image that reveals the electromagnetic properties and bedrock stratigraphy — the arrangement of rock layers — of Jezero’s floor to depths of 15 meters, or about 49 feet. The image reveals the presence of ubiquitous layered rock strata, including those that are inclined at up to 15 degrees. Compounding the mystery, within those inclined areas are some perplexing highly reflective rock layers that in fact tilt in multiple directions.

“RIMFAX is giving us a view of Mars stratigraphy similar to what you can see on Earth in highway road cuts, where tall stacks of rock layers are sometimes visible in a mountainside as you drive by,” Paige explained. “Before Perseverance landed, there were many hypotheses about the exact nature and origin of the crater floor materials. We’ve now been able to narrow down the range of possibilities, but the data we’ve acquired so far suggest that the history of the crater floor may be quite a bit more complicated than we had anticipated.”

The data collected by RIMFAX will provide valuable context to rock samples Perseverance is collecting, which will eventually be brought back to Earth.

“RIMFAX is giving us the backstory of the samples we’re going to analyze. It’s exciting that the rover’s instruments are producing data and we’re starting to learn, but there’s a lot more to come,” Paige said. “We landed on the crater floor, but now we’re driving up on the actual delta, which is the main target of the mission. This is just the beginning of what we’ll hopefully soon know about Mars.”

The paper, “Ground penetrating radar observations of subsurface structures in the floor of Jezero crater, Mars,” is one of three simultaneously published papers discussing some of the first data from Perseverance.

Explore the Solar System With NASA’s New, Improved 3D ‘Eyes’

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The agency’s newly upgraded “Eyes on the Solar System” visualization tool includes Artemis I’s trajectory along with a host of other new features.

NASA has revamped its “Eyes on the Solar System” 3D visualization tool, making interplanetary travel easier and more interactive than ever. More than two years in the making, the update delivers better controls, improved navigation, and a host of new opportunities to learn about our incredible corner of the cosmos – no spacesuit required. All you need is a device with an internet connection.

 Trace the course Artemis I will take to lunar orbit, or touch down with Perseverance during its harrowing entry, descent, and landing on the Red Planet. Learn the basics about dwarf planets or the finer points of gas giants, and ride alongside no fewer than 126 space missions past and present. You can even follow the paths of spacecraft and celestial bodies as far back as 1949 and as far into the future as 2049.

While you’re at it, you can rotate objects, compare them side by side, and even modulate the perspective as well as the lighting. The visuals are striking. This latest version of “Eyes” also lets you scroll through rich interactive journeys, including Voyager’s Grand Tour of Jupiter, Saturn, Uranus, and Neptune.

“The beauty of the new browser-based ‘Eyes on the Solar System’ is that it really invites exploration. You just need an internet connection, a device that has a web browser, and some curiosity,” said Jason Craig, the producer of the “Eyes” software at NASA’s Jet Propulsion Laboratory.

NASA hopes to Launch Artemis I Moon Mission on Sept 3

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NASA will target Saturday, Sept. 3 at 2:17 p.m. EDT, the beginning of a two-hour window, for the launch of Artemis I, the first integrated test of NASA’s Orion spacecraft, Space Launch System (SLS) rocket, and the ground systems at the agency’s Kennedy Space Center in Florida.

Mission managers met Tuesday to discuss data and develop a forward plan to address issues that arose during an Aug. 29 launch attempt for the flight test. During that launch attempt, teams were not able to chill down the four RS-25 engines to approximately minus 420 degrees F, with engine 3 showing higher temperatures than the other engines. Teams also saw a hydrogen leak on a component of the tail service mast umbilical quick disconnect, called the purge can, and managed the leak by manually adjusting propellant flow rates.

Artemis I launch on Aug 27, 2022 / NASA

In the coming days, teams will modify and practice propellant loading procedures to follow a procedure similar to what was successfully performed during the Green Run at NASA’s Stennis Space Center in Mississippi. The updated procedures would perform the chilldown test of the engines, also called the kick start bleed test, about 30 to 45 minutes earlier in the countdown during the liquid hydrogen fast fill liquid phase for the core stage.

Teams also are configuring platforms at Launch Pad 39B to enable engineers access to the purge can on the tail service mast umbilical. Once access is established, technicians will perform assessments and torque connection points where necessary.

Meteorologists with the U.S. Space Force Space Launch Delta 45 predict favorable weather conditions for Saturday. While rain showers are expected, they are predicted to be sporadic during the launch window.

The mission management team will reconvene Thursday to review data and overall readiness.

Stephen Hawking’s final theory on Big Bang published, What it says?

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Professor Stephen Hawking’s final theory on the origin of the universe, predicting the universe is finite and far simpler than many current theories on it, has been published on Wednesday, April 2, 2018 in the Journal of High Energy Physics.

The theory, worked in collaboration with Professor Thomas Hertog from KU Leuven, was submitted for publication before Hawking’s death earlier this year.

Modern theories of the big bang predict that our local universe came into existence due to inflation within a tiny fraction of a second after the big bang itself, and the universe expanded at an exponential rate. “The usual theory of eternal inflation predicts that globally our universe is like an infinite fractal, with a mosaic of different pocket universes, separated by an inflating ocean,” said Hawking in an interview last year.

In their new paper, Hawking and Hertog say this account of eternal inflation is wrong. “It assumes an existing background universe that evolves according to Einstein’s theory of general relativity and treats the quantum effects as small fluctuations around this,” said Hertog. “However, the dynamics of eternal inflation wipes out the separation between classical and quantum physics. As a consequence, Einstein’s theory breaks down in eternal inflation.”

On his part, Hawking said, “We predict that our universe, on the largest scales, is reasonably smooth and globally finite. So it is not a fractal structure.”

The theory of eternal inflation that Hawking and Hertog put forward is based on string theory concept of holography, which postulates that the universe is a large and complex hologram: physical reality in certain 3D spaces can be mathematically reduced to 2D projections on a surface.

Hawking’s earlier ‘no boundary theory’ predicted that if you go back in time to the beginning of the universe, the universe shrinks and closes off like a sphere, but this new theory represents a different interpretation. “Now we’re saying that there is a boundary in our past,” said Hertog.

 

Hertog now plans to study the implications of the new theory on smaller scales within the reach of our space telescopes. He believes that primordial gravitational waves – ripples in space time – generated at the exit from eternal inflation constitute the most promising “smoking gun” to test the model.

The expansion of our universe since the beginning means such gravitational waves would have very long wavelengths, outside the range of the current LIGO detectors, which can be heard by the planned European space-based gravitational wave observatory, LISA.

‘Seeing’ the other side of our galaxy

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Astronomers have successfully traced a spiral arm on the far side of our Galaxy, an accomplishment that provides new insights into the structure of the Milky Way. Efforts to observe the far side of our Galaxy have been hampered by the vast distance and interstellar dust that blocks optical light from those regions. Here, Alberto Sanna and colleagues used radio interferometry with the Very Long Baseline Array to trace the motions of methanol and water molecules associated with a high-mass star-forming region on the far side of the Milky Way. Using the data, they were able to locate the Scutum-Centaurus spiral arm as it passes around the far side of the Galaxy and trace the arm through almost a complete rotation. The authors note that their data suggest that the pitch angle of the spiral arm (a measure of how tight the spiral is) may vary along its length. Their observations provide a record-breaking use of parallax, the apparent motion of distant objects as the Earth orbits the Sun, to measure the distance of stars. They also verify a new method of inferring distances on the far side of our Galaxy.

Nobel Prize for Physics, 2017 – Indian Connection

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The 2017 Nobel Prize for Physics has been conferred to three scientists namely Rainer Weiss, Barry C Barish & Kip S Thorne under the LIGO Project for their discovery of gravitational waves, 100 years after Einstein’s General Relativity predicted it. The Nobel Prize for Physics 2017 celebrates the direct detection of Gravitational waves arriving from the merger two large Black holes in a distant galaxy a Billion of light years away. Gravitational waves carry information about their dramatic origins and about the nature of gravity that cannot otherwise be obtained. This opens a new window to Astronomy since Gravitational Waves are an entirely new way of observing the most violent events in space.

This is a proud moment for India also, since the discovery paper has 39 Indian authors/scientists from nine institutions-, CMI Chennai, ICTS-TIFR Bengaluru, IISER-Kolkata, IISER-Trivandrum, IIT Gandhinagar, IPR Gandhinagar, IUCAA Pune, RRCAT Indore and TIFR Mumbai. primarily funded through individual/ institutional grants by Department of Atomic Energy, Department of Science & Technology and Ministry of Human Resource Development AE, DST and MHRD, who are co-authors of this discovery paper.

Late Professor CV Vishveshvara of RRI, Bengaluru (DST AI) and Professor SV Dhurandhar of IUCAA, Pune and some other Indian scientists made seminal contributions to this field which contributed towards the principles behind the LIGO Detector.

The group led by Bala Iyer (currently at ICTS-TIFR) at the Raman Research Institute in collaboration with scientists in France had pioneered the mathematical calculations used to model Gravitational Wave signals from orbiting black holes and neutron stars. Theoretical work that combined black holes and gravitational waves was published by C. V. Vishveshwara in 1970. These contributions are prominently cited in the discovery paper.

An opportunity for India taking leadership in this field has opened up with the LIGO-India mega-science project that was granted ‘in principle’ approval by the Union Cabinet on Feb 17 2016. LIGO-India brings forth a real possibility of Indian scientists and technologists stepping forward, with strong international cooperation, into the frontier of an emergent area of high visibility and promise presented by the recent GW detections and the high promise of a new window of gravitational-wave astronomy to probe the universe.

The global science community is unanimous that the future of Gravitational wave astronomy and astrophysics, beyond the first discovery, lies with the planned global array of GW detectors, including the LIGO-India observatory. Inclusion of LIGO-India greatly improves the angular resolution in the location of the gravitational-wave source by the LIGO global network. For the discovery event observed by the two advanced LIGO detectors in the US, with a hypothetical LIGO-India in operation, there would have been 100 times improvement in the angular resolution.

The LIGO-India proposal is for the construction and operation of an Advanced LIGO Detector in India in collaboration with the LIGO Laboratories, USA. The objective is to set up the Indian node of the three node global Advanced LIGO detector network by 2024 and operate it for 10 years. The task for LIGO-India includes the challenge of constructing the very large vaccum infrastructure that would hold a space of volume 10 million litres that can accommodate the entire 4 km scale laser interferometer in ultra high vacuum environment at nano-torrs. Indian team is also responsible for installation and commissioning the complex instrument and attaining the ultimate design sensitivity.

The LIGO-India project is being jointly executed by lead institutions: the Inter-University Centre for Astronomy and Astrophysics (IUCAA), Pune of the University Grants commission, and DAE organisations, Institute for Plasma Research (IPR), Gandhinagar, the Raja Ramanna Centre for Advanced Technology (RRCAT), Indore and the Directorate of Construction & Estate Management (DCSEM) of DAE.

LIGO-India is being jointly funded by the Department of Atomic Energy (DAE) and the Department of Science and Technology (DST). A LIGO-India Apex committee, together with the LIGO-India Project Management Board (LI-PMB) and LIGO-India Scientific Management Board (LI-SMB), were constituted in August 2016 to oversee the project execution, and there has been rapid pace of progress since then. LIGO-India is on track for commencing operations by 2024.

Hubble Spots Barred Spiral Galaxy Lynx

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Discovered by British astronomer William Herschel over 200 years ago, NGC 2500 lies about 30 million light-years away in the northern constellation of Lynx.

The NGC 2500 is a particular kind of spiral galaxy known as a barred spiral, its wispy arms swirling out from a bright, elongated core.

Barred spirals are actually more common than was once thought. Around two-thirds of all spiral galaxies — including the Milky Way — exhibit these straight bars cutting through their centers. These cosmic structures act as glowing nurseries for newborn stars, and funnel material towards the active core of a galaxy.

NGC 2500 is still actively forming new stars, although this process appears to be occurring very unevenly. The upper half of the galaxy — where the spiral arms are slightly better defined — hosts many more star-forming regions than the lower half, as indicated by the bright, dotted islands of light.

There is another similarity between NGC 2500 and our home galaxy. Together with Andromeda, Triangulum, and many smaller natural satellites, the Milky Way is part of the Local Group of galaxies, a gathering of over 50 galaxies all loosely held together by gravity.

NGC 2500 forms a similar group with some of its nearby neighbors, including NGC 2541, NGC 2552, NGC 2537, and the bright, Andromeda-like spiral NGC 2481, known collectively as the NGC 2841 group.