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Martian Dry Ice Gullies Formed By Seasonal CO2 Freezing, Not Water
2014-07-11 09:09:01

Gerard LeBlond for redOrbit.com - Your Universe Online NASA’s Mars Reconnaissance Orbiter (MRO) continually makes high-resolution observations of the surface of Mars. Recent images have revealed that the gullies on the surface are mainly formed by seasonal freezing of carbon dioxide and not liquid water. The report has been published online in the journal Icarus. In 2000, the first reports on these gullies suggested the presence of water on Mars created them by erosion, the same way...

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2010-10-29 13:55:00

A growing bounty of images from NASA's Mars Reconnaissance Orbiter reveals that the timing of new activity in one type of the enigmatic gullies on Mars implicates carbon-dioxide frost, rather than water, as the agent causing fresh flows of sand. Researchers have tracked changes in gullies on faces of sand dunes in seven locations on southern Mars. The periods when changes occurred, as determined by comparisons of before-and-after images, overlapped in all cases with the known winter build-up...

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2009-03-02 09:05:00

Planetary geologists at Brown University have found a gully fan system on Mars that formed about 1.25 million years ago. The fan offers compelling evidence that it was formed by melt water that originated in nearby snow and ice deposits and may stand as the most recent period when water flowed on the planet. Gullies are known to be young surface features on Mars. But scientists studying the planet have struggled with locating gullies they can conclusively date. In a paper that appears on the...

2006-12-11 18:00:16

By ALICIA CHANG Associated Press writer LOS ANGELES -- For decades, scientists have scoured Mars in search of water, a basic ingredient for primitive life. But the best clues were always tied to the ancient past when the Red Planet was warmer and wetter. On Wednesday, scientists made the startling announcement that water may still course through the frigid surface. Crisp photographs taken by NASA's old Mars Global Surveyor before it lost contact with Earth last month do not...

2006-12-09 00:00:06

By JOHN JOHNSON JR. NASA scientists announced Wednesday that they had found evidence that water still flows over the surface of Mars - sporadic gushers that increase the possibility that the Red Planet could harbor some form of life. Using images obtained by the Mars Global Surveyor spacecraft, the researchers concluded that geologic changes in the shapes and sizes of gullies cut into the walls of two Martian craters were likely made by flowing water. The team looked at two sets of...

2006-12-07 12:00:10

By Alicia Chang THE ASSOCIATED PRESS For decades, scientists have scoured Mars in search of water, a basic ingredient for primitive life. But the best clues were always tied to the ancient past when the Red Planet was warmer and wetter. On Wednesday, scientists made the startling announcement that water may still course through the frigid surface. Crisp photographs taken by NASA's old Mars Global Surveyor before it lost contact with Earth last month do not actually show flowing water....

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2006-12-06 18:01:08

By ALICIA CHANG LOS ANGELES - New photographs from space suggest that water occasionally flows on the frigid surface of Mars, raising the tantalizing possibility that the Red Planet is hospitable to life, scientists reported Wednesday. The new images, taken by NASA's Mars Global Surveyor before it lost contact with Earth, do not actually show flowing water. Rather, they show changes in craters that provide the strongest evidence yet that water coursed through them as recently as several...

2006-12-06 15:00:09

WASHINGTON, Dec. 6 /PRNewswire/ -- NASA photographs have revealed bright new deposits seen in two gullies on Mars that suggest water carried sediment through them sometime during the past seven years. "These observations give the strongest evidence to date that water still flows occasionally on the surface of Mars," said Michael Meyer, lead scientist for NASA's Mars Exploration Program, Washington. Liquid water, as opposed to the water ice and water vapor known to exist at Mars, is...

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2006-12-06 12:40:00

NASA photographs have revealed bright new deposits seen in two gullies on Mars that suggest water carried sediment through them sometime during the past seven years. "These observations give the strongest evidence to date that water still flows occasionally on the surface of Mars," said Michael Meyer, lead scientist for NASA's Mars Exploration Program, Washington. Liquid water, as opposed to the water ice and water vapor known to exist at Mars, is considered necessary for life. The new...


Word of the Day
abrosia
  • Wasting away as a result of abstinence from food.
The word 'abrosia' comes from a Greek roots meaning 'not' and 'eating'.