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Topic: European Space Agency

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 Scientists use satellite data to find Methane Hot Spot in United States

 

Written by Tony Phillips
Science at NASA

NASA - National Aeronautics and Space AdministrationWashington, D.C. – One small “hot spot” in the U.S. Southwest is responsible for producing the largest concentration of the greenhouse gas methane seen over the United States – more than triple the standard ground-based estimate — according to a new study of satellite data by scientists at NASA and the University of Michigan.

Methane is very efficient at trapping heat in the atmosphere and, like carbon dioxide, it contributes to global warming. The hot spot, near the Four Corners intersection of Arizona, Colorado, New Mexico and Utah, covers only about 2,500 square miles (6,500 square kilometers), or half the size of Connecticut.

The Four Corners area (red) is the major U.S. hot spot for methane emissions in this map showing how much emissions varied from average background concentrations from 2003-2009 (dark colors are lower than average; lighter colors are higher). (NASA/JPL-Caltech/University of Michigan)

The Four Corners area (red) is the major U.S. hot spot for methane emissions in this map showing how much emissions varied from average background concentrations from 2003-2009 (dark colors are lower than average; lighter colors are higher). (NASA/JPL-Caltech/University of Michigan)

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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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NASA reports Rosetta Spacecraft to release Philae Lander to Comet’s surface November 12th

 

Written by DC Agle/Guy Webster
NASA’s Jet Propulsion Laboratory

NASA - National Aeronautics and Space AdministrationPasadena, CA – The European Space Agency’s Rosetta mission will deploy its lander, Philae, to the surface of comet 67P/Churyumov-Gerasimenko on November 12th.

Rosetta is an international mission spearheaded by the European Space Agency with support and instruments provided by NASA.

Philae’s landing site, currently known as Site J, is located on the smaller of the comet’s two “lobes,” with a backup site on the larger lobe. The sites were selected just six weeks after Rosetta’s August 6th arrival at the comet, following the spacecraft’s 10-year journey through the solar system.

Image depicts the primary landing site on comet 67P/Churyumov-Gerasimenko chosen for the European Space Agency's Rosetta mission. (ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA)

Image depicts the primary landing site on comet 67P/Churyumov-Gerasimenko chosen for the European Space Agency’s Rosetta mission. (ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA)

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SpaceX’s Dragon spacecraft launches taking NASA’s RapidScat to International Space Station

 

Written by Alan Buis
NASA’s Jet Propulsion Laboratory

NASA - National Aeronautics and Space AdministrationPasadena, CA – A new NASA mission that will boost global monitoring of ocean winds for improved weather forecasting and climate studies is among about 5,000 pounds (2,270 kilograms) of NASA science investigations and cargo now on their way to the International Space Station aboard SpaceX’s Dragon spacecraft.

The cargo ship launched on the company’s Falcon 9 rocket from Space Launch Complex-40 at Cape Canaveral Air Force Station in Florida at 10:52pm PDT Saturday, September 20th (1:52am EDT Sunday, September 21st).

At Cape Canaveral Air Force Station's Space Launch Complex 40, the nine rocket engines roar to life on the Falcon launch vehicle. (NASA)

At Cape Canaveral Air Force Station’s Space Launch Complex 40, the nine rocket engines roar to life on the Falcon launch vehicle. (NASA)

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NASA’s Nuclear Spectroscopic Telescope Array (NuSTAR) discovers source of Intense Gamma Rays

 

Written by Whitney Clavin
NASA’s Jet Propulsion Laboratory

NASA - National Aeronautics and Space AdministrationPasadena, CA – Our Milky Way galaxy is littered with the still-sizzling remains of exploded stars.

When the most massive stars explode as supernovas, they don’t fade into the night, but sometimes glow ferociously with high-energy gamma rays. What powers these energetic stellar remains?

NASA’s Nuclear Spectroscopic Telescope Array, or NuSTAR, is helping to untangle the mystery. The observatory’s high-energy X-ray eyes were able to peer into a particular site of powerful gamma rays and confirm the source: A spinning, dead star called a pulsar.

The blue dot in this image marks the spot of an energetic pulsar -- the magnetic, spinning core of star that blew up in a supernova explosion. (NASA/JPL-Caltech/SAO)

The blue dot in this image marks the spot of an energetic pulsar — the magnetic, spinning core of star that blew up in a supernova explosion. (NASA/JPL-Caltech/SAO)

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NASA reports landing site for Rosetta Spacecraft’s Philae lander on comet set

 

Written by DC Agle and Dwayne Brown
NASA

NASA - National Aeronautics and Space AdministrationPasadena, CA – The European Space Agency’s Rosetta’s lander, Philae, will target Site J, an intriguing region on comet 67P/Churyumov-Gerasimenko that offers unique scientific potential, with hints of activity nearby, and minimum risk to the lander compared to the other candidate sites.

The 220-pound (100-kilogram) lander is scheduled to reach the surface on November 11th, where it will perform in-depth measurements to characterize the nucleus. Rosetta is an international mission spearheaded by the European Space Agency with support and instruments provided by NASA.

Image depicts the primary landing site on comet 67P/Churyumov-Gerasimenko chosen for the European Space Agency's Rosetta mission. (ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA)

Image depicts the primary landing site on comet 67P/Churyumov-Gerasimenko chosen for the European Space Agency’s Rosetta mission. (ESA/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA)

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