Tag Archives: iss

NASA’s Swift, Fermi missions detect exceptional cosmic blast

Posted on by
Reply

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.

NASA


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.”

Also Read:

Celebrate ‘International Observe the Moon Night’ with NASA [Details]

NASA’s Hubble finds spiraling stars ‘NGC 346’, providing window into early universe

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

NASA Sets TV Coverage for Crewed Soyuz Mission to Space Station[Live schedule details]

Posted on by
Reply

NASA will provide live coverage of key events as a NASA astronaut and two cosmonauts launch and dock to the International Space Station on Wednesday, Sept. 21.

NASA astronaut Frank Rubio and Roscosmos cosmonauts Sergey Prokopyev and Dmitri Petelin will launch aboard the Soyuz MS-22 spacecraft from the Baikonur Cosmodrome in Kazakhstan at 9:54 a.m. EDT Wednesday, Sept. 21 (6:54 p.m. Baikonur time). Coverage will begin at 9 a.m. on NASA Television’s Public Channel, the NASA app, and on the agency’s website.

NASA also will air continuous coverage of an Artemis I tanking test on NASA TV’s Media Channel beginning at 7:15 a.m.

At the Baikonur Cosmodrome in Kazakhstan, NASA astronaut Frank Rubio performs preflight checkouts in the Soyuz MS-22 spacecraft. Rubio is scheduled to launch with crewmates Roscosmos cosmonaut Sergey Prokopyev and Dmitri Petelin Sept. 21 for a six-month mission on the International Space Station.
Credits: NASA/Victor Zelentsov

Soyuz MS-22 launch and key events as well of coverage of the Artemis I tanking test will be available to watch online at:

https://www.nasa.gov/live

After a two-orbit, three-hour journey, the Soyuz will dock to the space station’s Rassvet module at 1:11 p.m. About two hours after docking, hatches between the Soyuz and the station will open and the crew members will greet each other.

Once aboard station, the trio will join Expedition 67 Commander Oleg Artemyev, cosmonauts Denis Matveev and Sergey Korsakov of Roscosmos, as well as NASA astronauts Bob Hines, Kjell Lindgren, and Jessica Watkins, and ESA (European Space Agency) astronaut Samantha Cristoforetti. Rubio, Prokopyev, and Petelin will spend six months aboard the orbital laboratory.

This will be Prokopyev’s second flight into space and the first for Rubio and Petelin.

Mission coverage is as follows (all times Eastern):

Wednesday, Sept. 21

9 a.m. – Coverage begins on NASA TV’s Public Channel for 9:54 a.m. launch.

12:15 p.m. – Coverage begins on NASA TV’s Public Channel for 1:11 p.m. docking.

3:30 p.m. – Coverage begins on NASA TV for hatch opening and welcome remarks.

NASA Remembers 9/11 World Trade Center Attacks

Posted on by
Reply

The attacks of Sept. 11, 2001 were a national tragedy that resulted in a staggering loss of life and a significant change in American culture. Each year, we pause and remember. Beyond honoring the Americans who died that day, NASA also assisted FEMA in New York in the days afterward, and remembered the victims by providing flags flown aboard the Space Shuttle to their families.

Expedition 3 Commander Frank Culbertson was aboard the International Space Station at the time of the attacks, and the only American on the crew. As soon as he learned of the attacks, he began documenting the event in photographs because the station was flying over the New York City area. He captured incredible images in the minutes and hours following the event. From his unique vantage point in space, he recorded his thoughts of the world changing beneath him.

The following day, he posted a public letter that captured his initial thoughts of the events as they unfolded. “The world changed today. What I say or do is very minor compared to the significance of what happened to our country today when it was attacked.”

Visible from space, a smoke plume rises from the Manhattan area after two planes crashed into the towers of the World Trade Center. This photo was taken of metropolitan New York City (and other parts of New York as well as New Jersey) the morning of September 11, 2001. 
Credits: NASA

Upon further reflection, Culbertson said, “It’s horrible to see smoke pouring from wounds in your own country from such a fantastic vantage point. The dichotomy of being on a spacecraft dedicated to improving life on the earth and watching life being destroyed by such willful, terrible acts is jolting to the psyche, no matter who you are.”

NASA science programs were called into action after Sept. 11, 2001, as the agency worked with FEMA to fly sensors over the affected areas on aircraft looking for aerial contaminants and used satellite resources to monitor from above.

Flags for Heroes and Families

NASA flew nearly 6,000 4 by 6 inch flags on Endeavour’s flight during STS-108 to honor the victims of the terrorist attacks in New York, Washington, D.C. and Pennsylvania. Students working at Johnson Space Center in Houston, Texas assembled the commemorative packages, including the U.S. flags flown in space, to be presented to relatives of the victims. Distribution began on June 14, 2002, National Flag Day, at a ceremony held at the American Museum of Natural History’s Rose Center for Earth and Space in New York.

“The ‘Flags for Heroes and Families’ campaign is a way for us to honor and show our support for the thousands of brave men and women who have selflessly contributed to the relief and recovery efforts,” said then-NASA Administrator Dan Goldin. “The American flags are a patriotic symbol of our strength and solidarity, and our Nation’s resolve to prevail.”

NASA/Photo: Nasa.gov

“NASA wanted to come up with an appropriate tribute to the people who lost their lives in the tragic events of September 11,” added Goldin. “America’s space program has a long history of carrying items into space to commemorate historic events, acts of courage and dramatic achievements. ‘Flags for Heroes and Families’ is a natural extension of this ongoing outreach project.”

Internet for All? SpaceX just launched 60 satellites into space orbit, as part of its Starlink fleet

Posted on by
1

On Wednesday, June 3 at 9:25 p.m. EDT, SpaceX launched its eighth Starlink mission aboard Falcon 9, which lifted off from Space Launch Complex 40 (SLC-40) at Cape Canaveral Air Force Station, just days after SpaceX and NASA made history amid coronavirus pandemic last weekend, launching two astronauts into space on board a Falcon 9 rocket to join the International Space Station (ISS).

Astronauts Robert Behnken and Douglas Hurley were launched into space on board a SpaceX Falcon 9 rocket, marking the first time humans have been launched from the US since 2011.

Falcon 9’s first stage previously supported the Telstar 18 VANTAGE mission in September 2018, the Iridium-8 mission in January 2019, and two separate Starlink missions in May 2019 and in January 2020. Following stage separation, SpaceX landed Falcon 9’s first stage on the “Just Read the Instructions” droneship, which was stationed in the Atlantic Ocean.

On this mission, SpaceX launched the first Starlink satellite with a deployable visor to block sunlight from hitting the brightest spots of the spacecraft. NASA’s Kennedy Space Centre said: “The goal of Starlink is to create a network that will help provide internet services to those who are not yet connected, and to provide reliable and affordable internet across the globe.”

Starlink Satellite

Explaining the Starlink satellite design, SpaceX said on its website that it was driven by the fact that they fly at a very low altitude compared to other commmunication satellites. “We do this to prioritize space traffic safety and to minimize the latency of the signal between the satellite and the users who are getting internet service from it. Because of the low altitude, drag is a major factor in the design.”

During orbit raise, the satellites must minimize their cross-sectional area relative to the wind, otherwise drag will cause them to fall out of orbit. High drag is a double-edged sword—it means that flying the satellites is tricky, but it also means that any satellites that are experiencing problems will de-orbit quickly and safely burn up in the atmosphere. This reduces the amount of orbital debris or “space junk” in orbit.

This low-drag and thrusting flight configuration resembles an open book, where the solar array is laid out flat in front of the vehicle. When Starlink satellites are orbit raising, they roll to a limited extent about the velocity vector for power generation, always keeping the cross sectional area minimized while keeping the antennas facing Earth enough to stay in contact with the ground stations, said SpaceX.

Shark-Fin orientation

When the satellites reach their operational orbit of 550 km, drag is still a factor—so any inoperable satellite will quickly decay—but the altitude control system is able to overcome this drag with the solar array raised above the satellite in a vertical orientation that we call “shark-fin.” This is the orientation in which the satellite spends the majority of its operational life.

A recent study, published in arXiv, researchers led by Stefano Gallozzi, wrote: “Depending on their altitude and surface reflectivity, their contribution to the sky brightness is not negligible for professional ground based observations. With the huge amount of about 50,000 new artificial satellites for telecommunications planned to be launched in Medium and Low Earth Orbit, the mean density of artificial objects will be of >1 satellite for square sky degree; this will inevitably harm professional astronomical images.”

Sperm being sent to ISS to see whether they squirm the same way in Space

Posted on by
Reply

Remember when you first learned about reproduction process in health class at school? Well, NASA biologists are wondering how some of those basics of how fertilization would work if sperm and egg were to unite in space. In other words, having sex aboard on ISS and examine how the sperm squirm in weightlessness — is their plan.

A cargo mission is launching to the International Space Station in April 2018 to study how weightlessness affects sperm. NASA’s Ames Research Center in California’s Silicon Valley manages the investigation, called Micro-11, aboard SpaceX’s 14th cargo resupply services mission to the International Space Station for NASA.

Little is currently known about the biology of reproduction in space, and this experiment will begin to address that gap by measuring, for the first time, how well bull and human sperm functions in space, said NASA in a statement. Studying reproductive biology in space is useful because the unique environment of microgravity can reveal processes and connections not visible in gravity on Earth, it explained the rationale behind such step.

In mammals, including humans, fertilization occurs when a sperm cell swims toward an egg and fuses with it. Before this can happen, the sperm cell must be activated to start moving. Next, to prepare it for fusing with the egg, the sperm needs to move faster, and its cell membrane must become more fluid.

Previous experiments with sea urchin and bull sperm suggest that activating movement happens more quickly in microgravity, while the steps leading up to fusion happen more slowly, or not at all. Delays or problems at this stage could prevent fertilization from happening in space.

For this experiment, two types of mammalian sperm, human and bull, will be sent to the space station as frozen samples. Bull sperm show similar changes in movement and other markers of fertility as human sperm. However, human sperm are inherently more varied in motion and appearance. So, the measurements of bull sperm will provide quality control to ensure the researchers can detect subtle differences in sperm from both species.

The astronaut crew will thaw the samples and add chemical mixtures that trigger activation of sperm movement and preparation for fusing with an egg. Researchers will use video to assess how well the space sperm move. Finally, the samples will be mixed with preservatives and returned to Earth, where they’ll be analyzed to see whether the steps necessary for fusion occurred and whether the samples from space differ from sperm samples activated on the ground.

We don’t know yet how long-duration spaceflight affects human reproductive health, and this investigation would be the first step in understanding the potential viability of reproduction in reduced-gravity conditions.

Managed by NASA’s Ames Research Center in California’s Silicon Valley, the Micro-11’s principal investigator for the fertilization in space experiment is Joseph S. Tash of the University of Kansas Medical Center in Kansas City. The experimental hardware for Micro-11 was developed by BioServe Space Technologies at the University of Colorado Boulder, and will launch aboard SpaceX’s 14th cargo resupply services mission to the International Space Station for NASA.