samedi 10 septembre 2016
Mars Rover Views Spectacular Layered Rock Formations
NASA - Mars Science Laboratory (MSL) logo.
September 10, 2016
Image above: Curiosity got close to this outcrop on Sept. 9, 2016, which displays finely layered rocks. Image Credits: NASA/JPL-Caltech/MSSS.
The layered geologic past of Mars is revealed in stunning detail in new color images returned by NASA's Curiosity Mars rover, which is currently exploring the "Murray Buttes" region of lower Mount Sharp. The new images arguably rival photos taken in U.S. National Parks.
Curiosity took the images with its Mast Camera (Mastcam) on Sept. 8. The rover team plans to assemble several large, color mosaics from the multitude of images taken at this location in the near future.
Image above: The rim of Gale Crater is visible in the distance, through the dusty haze, in this Curiosity view of a sloping hillside on Mount Sharp. Image Credits: NASA/JPL-Caltech/MSSS.
"Curiosity's science team has been just thrilled to go on this road trip through a bit of the American desert Southwest on Mars," said Curiosity Project Scientist Ashwin Vasavada, of NASA's Jet Propulsion Laboratory, Pasadena, California.
The Martian buttes and mesas rising above the surface are eroded remnants of ancient sandstone that originated when winds deposited sand after lower Mount Sharp had formed.
Image above: Curiosity viewed sloping buttes and layered outcrops as it exited the "Murray Buttes" region on lower Mount Sharp, Sept. 9, 2016. Image Credits: NASA/JPL-Caltech/MSSS.
"Studying these buttes up close has given us a better understanding of ancient sand dunes that formed and were buried, chemically changed by groundwater, exhumed and eroded to form the landscape that we see today," Vasavada said.
The new images represent Curiosity's last stop in the Murray Buttes, where the rover has been driving for just over one month. As of this week, Curiosity has exited these buttes toward the south, driving up to the base of the final butte on its way out. In this location, the rover began its latest drilling campaign (on Sept. 9). After this drilling is completed, Curiosity will continue farther south and higher up Mount Sharp, leaving behind these spectacular formations.
Image above: This closeup view from NASA's Curiosity rover shows finely layered rocks, deposited by wind long ago as migrating sand dunes. Image Credits: NASA/JPL-Caltech/MSSS.
Curiosity landed near Mount Sharp in 2012. It reached the base of the mountain in 2014 after successfully finding evidence on the surrounding plains that ancient Martian lakes offered conditions that would have been favorable for microbes if Mars has ever hosted life. Rock layers forming the base of Mount Sharp accumulated as sediment within ancient lakes billions of years ago.
On Mount Sharp, Curiosity is investigating how and when the habitable ancient conditions known from the mission's earlier findings evolved into conditions drier and less favorable for life.
Image above: This view from Curiosity shows a dramatic hillside outcrop with sandstone layers that scientists refer to as "cross-bedding." Image Credits: NASA/JPL-Caltech/MSSS.
For more information about Curiosity, visit: http://mars.jpl.nasa.gov/msl
Images (mentioned), Text, Credits: NASA/JPL/Preston Dyches.
Publié par Orbiter.ch à 04:21