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Topic: Italian Space Agency

NASA’s Cassini spacecraft data reveals Jupiter’s moon Europa has thinner atmosphere than expected

 

Written by Preston Dyches
NASA’s Jet Propulsion Laboratory

NASA - National Aeronautics and Space AdministrationPasadena, CA – A fresh look at data collected by NASA’s Cassini spacecraft during its 2001 flyby of Jupiter shows that Europa’s tenuous atmosphere is even thinner than previously thought and also suggests that the thin, hot gas around the moon does not show evidence of plume activity occurring at the time of the flyby.

The new research provides a snapshot of Europa’s state of activity at that time, and suggests that if there is plume activity, it is likely intermittent.

Jupiter's icy moon Europa displays many signs of activity, including its fractured crust and a dearth of impact craters. Scientists continue to hunt for confirmation of plume activity. (NASA/JPL-Caltech/SETI Institute)

Jupiter’s icy moon Europa displays many signs of activity, including its fractured crust and a dearth of impact craters. Scientists continue to hunt for confirmation of plume activity. (NASA/JPL-Caltech/SETI Institute)

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NASA’s Cassini Mission data reveals Jupiter’s Red Spot probably created by Chemical reaction to Sunlight

 

Written by Preston Dyches
NASA’s Jet Propulsion Laboratory

NASA - National Aeronautics and Space AdministrationPasadena, CA – The ruddy color of Jupiter’s Great Red Spot is likely a product of simple chemicals being broken apart by sunlight in the planet’s upper atmosphere, according to a new analysis of data from NASA’s Cassini mission. The results contradict the other leading theory for the origin of the spot’s striking color — that the reddish chemicals come from beneath Jupiter’s clouds.

The results are being presented this week by Kevin Baines, a Cassini team scientist based at NASA’s Jet Propulsion Laboratory, Pasadena, California, at the American Astronomical Society’s Division for Planetary Science Meeting in Tucson, Arizona.

Research suggests effects of sunlight produce the color of Jupiter's Great Red Spot. The feature's clouds are much higher than those elsewhere on the planet, and its vortex nature confines the reddish particles once they form. (NASA/JPL-Caltech/ Space Science Institute)

Research suggests effects of sunlight produce the color of Jupiter’s Great Red Spot. The feature’s clouds are much higher than those elsewhere on the planet, and its vortex nature confines the reddish particles once they form. (NASA/JPL-Caltech/ Space Science Institute)

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NASA’s Cassini spacecraft finds two new features about Saturn’s moon Titan’s Hydrocarbon Seas

 

Written by Preston Dyches
NASA’s Jet Propulsion Laboratory

NASA - National Aeronautics and Space AdministrationPasadena, CA – NASA’s Cassini mission continues its adventures in extraterrestrial oceanography with new findings about the hydrocarbon seas on Saturn’s moon Titan.

During a flyby in August, the spacecraft sounded the depths near the mouth of a flooded river valley and observed new, bright features in the seas that might be related to the mysterious feature that researchers dubbed the “magic island.”

The findings are being presented this week at the Division for Planetary Sciences Meeting of the American Astronomical Society held in Tucson, Arizona.

Cassini radar data reveal the depth of a liquid methane/ethane sea on Saturn's moon Titan near the mouth of a large, flooded river valley. (NASA/JPL-Caltech/ASI/Cornell)

Cassini radar data reveal the depth of a liquid methane/ethane sea on Saturn’s moon Titan near the mouth of a large, flooded river valley. (NASA/JPL-Caltech/ASI/Cornell)

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NASA to launch Sounding Rocket that will take 1,500 pictures in 5 minutes of the Sun

 

NASA’s Jet Propulsion Laboratory

NASA - National Aeronautics and Space AdministrationPasadena, CA – When Galileo first observed Venus displaying a crescent phase, he excitedly wrote to Kepler (in anagram) of Venus mimicking the moon-goddess. He would have been delirious with joy to see Saturn and Titan, seen in this image, doing the same thing.

More than just pretty pictures, high-phase observations — taken looking generally toward the Sun, as in this image — are very powerful scientifically since the way atmospheres and rings transmit sunlight is often diagnostic of compositions and physical states.

The Rapid Acquisition Imaging Spectrograph Experiment is seen peeking out of a clean room during the weeks of testing before its scheduled November 2014 launch. (NASA/RAISE)

The Rapid Acquisition Imaging Spectrograph Experiment is seen peeking out of a clean room during the weeks of testing before its scheduled November 2014 launch. (NASA/RAISE)

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NASA’s Cassini spacecraft takes photo of sunlight reflecting off the seas on Saturn’s moon Titan

 

Written by Preston Dyches
NASA’s Jet Propulsion Laboratory

NASA - National Aeronautics and Space AdministrationPasadena, CA – As it soared past Saturn’s large moon Titan recently, NASA’s Cassini spacecraft caught a glimpse of bright sunlight reflecting off hydrocarbon seas.

In the past, Cassini had captured, separately, views of the polar seas and the sun glinting off them, but this is the first time both have been seen together in the same view.

This near-infrared, color view from Cassini shows the sun glinting off of Titan's north polar seas. (NASA/JPL-Caltech/Univ. Arizona/Univ. Idaho)

This near-infrared, color view from Cassini shows the sun glinting off of Titan’s north polar seas. (NASA/JPL-Caltech/Univ. Arizona/Univ. Idaho)

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NASA’s Cassini mission images suggests Saturn’s moon Mimas has a frozen core or a liquid ocean

 

Written by Preston Dyches
NASA’s Jet Propulsion Laboratory

NASA - National Aeronautics and Space AdministrationPasadena, CA – A new study focused on the interior of Saturn’s icy moon Mimas suggests its cratered surface hides one of two intriguing possibilities: Either the moon’s frozen core is shaped something like a football, or the satellite contains a liquid water ocean.

Researchers used numerous images of Mimas taken by NASA’s Cassini mission to determine how much the moon wobbles as it orbits Saturn. They then evaluated several possible models for how its interior might be arranged, finding two possibilities that fit their data.The study is published in the October 17th issue of the journal Science.

This mosaic of Saturn's moon Mimas was created from images taken by NASA's Cassini spacecraft during its closest flyby of the moon on Feb. 13, 2010. (NASA/JPL-Caltech/Space Science Institute)

This mosaic of Saturn’s moon Mimas was created from images taken by NASA’s Cassini spacecraft during its closest flyby of the moon on Feb. 13, 2010. (NASA/JPL-Caltech/Space Science Institute)

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NASA’s Cassini Spacecraft was bathed in beam of electrons during flyby of Saturn’s moon Hyperion

 

Written by Preston Dyches
NASA’s Jet Propulsion Laboratory

NASA - National Aeronautics and Space AdministrationPasadena, CA – Static electricity is known to play an important role on Earth’s airless, dusty moon, but evidence of static charge building up on other objects in the solar system has been elusive until now.

A new analysis of data from NASA’s Cassini mission has revealed that, during a 2005 flyby of Saturn’s moon Hyperion, the spacecraft was briefly bathed in a beam of electrons coming from the moon’s electrostatically charged surface.

Cassini obtained this false-color view of Saturn's chaotically tumbling moon Hyperion during a flyby on Sept. 26, 2005. The spacecraft detected a strong electrostatic charge on the moon's surface, a first for any body other than Earth's moon. (NASA/JPL-Caltech/Space Science Institute)

Cassini obtained this false-color view of Saturn’s chaotically tumbling moon Hyperion during a flyby on Sept. 26, 2005. The spacecraft detected a strong electrostatic charge on the moon’s surface, a first for any body other than Earth’s moon. (NASA/JPL-Caltech/Space Science Institute)

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NASA reports Rosetta Spacecraft takes Selfie with Comet

 

Written by DC Agle
NASA’s Jet Propulsion Laboratory

NASA - National Aeronautics and Space AdministrationPasadena, CA – A camera aboard the European Space Agency’s Philae lander snapped this “selfie” of one of the Rosetta spacecraft’s 52-foot-long (16-meter) solar arrays, with comet 67P/Churyumov-Gerasimenko hovering in the background some 10 miles (16 kilometers) away.

The image, taken by the Comet Infrared and Visible Analyser (CIVA), was taken on October 7th. Philae, which is connected to the Rosetta orbiter at this time, will make its descent to the surface of the comet on November 12th.

A composite image from a camera on the Rosetta mission's Philae comet lander shows a solar array, with comet 67P/Churyumov-Gerasimenko in the background. (ESA/Rosetta/Philae/CIVA)

A composite image from a camera on the Rosetta mission’s Philae comet lander shows a solar array, with comet 67P/Churyumov-Gerasimenko in the background. (ESA/Rosetta/Philae/CIVA)

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NASA reports Rosetta Spacecraft’s target Comet begins Jet Activity

 

Written by DC Agle
NASA’s Jet Propulsion Laboratory

NASA - National Aeronautics and Space AdministrationPasadena, CA – The four images that make up a new montage of comet 67P/Churyumov-Gerasimenko were taken on September 26th, 2014 by the European Space Agency’s Rosetta spacecraft. At the time, Rosetta was about 16 miles (26 kilometers) from the center of the comet.

In the montage, a region of jet activity can be seen at the neck of the comet. These jets, originating from several discrete locations, are a product of ices sublimating and gases escaping from inside the nucleus.

An image taken by the ESA Rosetta spacecraft shows jets of dust and gas escaping from the nucleus of comet 67P/Churyumov-Gerasimenko. (ESA/Rosetta/NAVCAM)

An image taken by the ESA Rosetta spacecraft shows jets of dust and gas escaping from the nucleus of comet 67P/Churyumov-Gerasimenko. (ESA/Rosetta/NAVCAM)

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NASA’s Cassini spacecraft observes strange feature in sea on Saturn’s moon Titan

 

Written by Preston Dyches
NASA’s Jet Propulsion Laboratory

NASA - National Aeronautics and Space AdministrationPasadena, CA – NASA’s Cassini spacecraft is monitoring the evolution of a mysterious feature in a large hydrocarbon sea on Saturn’s moon Titan. The feature covers an area of about 100 square miles (260 square kilometers) in Ligeia Mare, one of the largest seas on Titan.

It has now been observed twice by Cassini’s radar experiment, but its appearance changed between the two apparitions.

These three images, created from Cassini Synthetic Aperture Radar (SAR) data, show the appearance and evolution of a mysterious feature in Ligeia Mare, one of the largest hydrocarbon seas on Saturn's moon Titan. (NASA/JPL-Caltech/ASI/Cornell)

These three images, created from Cassini Synthetic Aperture Radar (SAR) data, show the appearance and evolution of a mysterious feature in Ligeia Mare, one of the largest hydrocarbon seas on Saturn’s moon Titan. (NASA/JPL-Caltech/ASI/Cornell)

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