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Edward Stone: 50 Years at NASA ends, but his brainchild Voyager’s Project goes on

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Stone’s remarkable tenure on NASA’s longest-operating mission spans decades of historic discoveries and firsts.

Edward Stone has retired as the project scientist for NASA’s Voyager mission a half-century after taking on the role. Stone accepted scientific leadership of the historic mission in 1972, five years before the launch of its two spacecraft, Voyager 1 and Voyager 2. Under his guidance, the Voyagers explored the four giant planets and became the first human-made objects to reach interstellar space, the region between the stars containing material generated by the death of nearby stars.

Until now, Stone was the only person to have served as project scientist for Voyager, maintaining his position even while serving as director of NASA’s Jet Propulsion Laboratory in Southern California from 1991 to 2001. JPL manages the Voyager mission for NASA. Stone retired from JPL in 2001 but continued to serve as the mission’s project scientist.

“It has been an honor and a joy to serve as the Voyager project scientist for 50 years,” Stone said. “The spacecraft have succeeded beyond expectation, and I have cherished the opportunity to work with so many talented and dedicated people on this mission. It has been a remarkable journey, and I’m thankful to everyone around the world who has followed Voyager and joined us on this adventure.”

Edward Stone

Edward Stone, second from left, and other members of the Voyager team pose with a model of the spacecraft in 1977, the year the twin probes launched. Credit: NASA/JPL-Caltech

Linda Spilker will succeed Stone as Voyager’s project scientist as the twin probes continue to explore interstellar space. Spilker was a member of the Voyager science team during the mission’s flybys of Jupiter, Saturn, Uranus, and Neptune. She later became project scientist for NASA’s now-retired Cassini mission to Saturn, and rejoined Voyager as deputy project scientist in 2021.

Jamie Rankin, a research scientist at Princeton University and a member of the Voyager science steering group, has been appointed deputy project scientist for the mission. Rankin received her Ph.D. in 2018 from Caltech, where Stone served as her advisor. Her research combines data from Voyager and other missions in NASA’s heliophysics fleet.

The twin Voyager spacecraft launched in 1977, on a mission to explore Jupiter and Saturn, ultimately revealing never-before-seen features of those planets and their moons. Voyager 1 continued its journey out of the solar system, while Voyager 2 continued on to Uranus and Neptune – and remains the only spacecraft to have visited the ice giants.

Edward Stone

Edward Stone, left, talks to reporters at a news conference to announce findings from Voyager 2’s flyby of Uranus in 1986. Credit: NASA/JPL-Caltech

Following this “grand tour” of the outer planets, the Voyager Interstellar Mission began. The goal was to exit the heliosphere – a protective bubble created by the Sun’s magnetic field and outward flow of solar wind (charged particles from the Sun). Voyager 1 crossed the boundary of the heliosphere and entered interstellar space in 2012, followed by Voyager 2 (traveling slower and in a different direction) in 2018. Today, as part of NASA’s longest-running mission, both spacecraft continue to illuminate the interplay between our Sun, and the particles and magnetic fields in interstellar space.

“Ed likes to say that Voyager is a mission of discovery, and it certainly is,” said Suzanne Dodd, Voyager project manager. “From the flybys of the outer planets in the 1970s and ’80s, to the heliopause crossing and current travels through interstellar space, Voyager never ceases to surprise and amaze us. All those milestones and successes are due to Ed’s exceptional scientific leadership and his keen ability to share his excitement about these discoveries to the world.”

Among the many honors bestowed on him, Stone has been a member of the National Academy of Sciences since 1984. He was awarded the National Medal of Science from President George H.W. Bush in 1991. When Stone was interviewed on the late-night TV show “The Colbert Report” in 2013, NASA arranged for host Stephen Colbert to present him with the NASA Distinguished Public Service Medal, the agency’s highest honor for a nongovernment individual. In 2019, he received the Shaw Prize in Astronomy from the Shaw Foundation in Hong Kong for his work on the Voyager mission.

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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-Cassini Probe: Image of Titan’s Tallest Mountain Measuring 10948 Ft Mesmerizes

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NASA’s Cassini probe mission has sent images of Saturn’s moon Titan showing some tallest mountains on its surface measuring more than 10,000 feet.

The mountainous ridges called the Mithrim Montes showed three series of mountain ridges and the top measured 10,948 feet in height. Most of these mountain ridges are located near the equator. The region is called Xanadu.

“It’s not only the highest point we’ve found so far on Titan, but we think it’s the highest point we’re likely to find,” said Stephen Wall of the Cassini radar team at NASA. Another observer of the Cassini radar team Jani Radebaugh said, “Titan’s extremes also tell us important things about forces affecting its evolution.”

The mountainous cliffs point at the evolution of a planet where forces have shoved the surface upward from underneath. Earth too has similar mountains and cliffs and the tallest mountain Everest is one such star example. The Himalaya and Andes Mountains still manifest such forces of nature underneath.

Cassini has found that Titan also has rain and rivers and some active tectonic forces causing quakes. Titan’s rotation, tidal forces from Saturn or cooling of the crust are some of its natural effects tied to this phenomenon.

Since its arrival in 2004, Cassini’s observations have changed whole dimension of saturn and its largest moon Titan. It has revealed that Titan’s surface is shaped by rivers and lakes of liquid ethane and methane, which forms clouds and causes occasional rains from the sky as water does on Earth. Winds sculpt vast regions of dark, hydrocarbon-rich dunes that girdle the moon’s equator and low latitudes, while volcanoes erupt spewing liquid water as the lava.

On its journey to Saturn, Cassini carried the European-built Huygens probe, which landed on Jan. 14, 2005, becoming humankind’s first landing on a body in the Outer Solar System when it parachuted through Titan’s murky skies. Currently, scientists are eager to get new data that could confirm the presence of a liquid ocean beneath the Titan’s surface.

Radar images do not present scenes as they would appear to human eyes but use radio waves beamed by the spacecraft that are reflected and scattered off of Titan’s surface in order to see through Titan’s opaque atmosphere. Bright regions indicate materials that are rough or that otherwise scatter the beam; dark regions indicate materials that are relatively smooth or that otherwise absorb radar waves. A side effect of this technique is the grainy pattern called “speckle” that typically is present in Cassini radar images.

This view was produced using a technique for handling noise in Cassini radar images, called despeckling, that produces clearer, easier-to-interpret views. Titan’s icy crust sits atop a deep ocean of liquid water that probably acts much like Earth’s upper mantle — the layer of hot, high-pressure rock below the crust that can slowly flow and deform over time.

This radar view was obtained on May 12, 2008 taken from a location at 2 degrees south latitude, 127 degrees west longitude. The incidence angle is about 34 degrees.

The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. NASA’s Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA’s Science Mission Directorate, Washington.