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Blobrana


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RE: Mars
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NASA Orbiter Reveals Big Changes in Mars' Atmosphere

NASA's Mars Reconnaissance Orbiter has discovered the total amount of atmosphere on Mars changes dramatically as the tilt of the planet's axis varies. This process can affect the stability of liquid water, if it exists on the Martian surface, and increase the frequency and severity of Martian dust storms.
Researchers using the orbiter's ground-penetrating radar identified a large, buried deposit of frozen carbon dioxide, or dry ice, at the Red Planet's south pole. The scientists suspect that much of this carbon dioxide enters the planet's atmosphere and swells the atmosphere's mass when Mars' tilt increases. The findings are published in this week's issue of the journal Science.

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Blobrana


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Les volcans de Mars, témoins de son refroidissement

Le manteau de Mars se refroidirait de 30 à 40°C par milliard d'années. C'est la conclusion des chercheurs du CNRS et de l'Université Paul Sabatier à Toulouse, qui ont reconstitué l'évolution thermique de cette planète depuis 4 milliards d'années, pour la première fois, à partir de la composition des roches volcaniques observées par satellite. Ces valeurs impliquent un refroidissement plus lent que pour la Terre (70 à 100°C par milliard d'années). Elles soulignent la particularité de notre planète, dont l'évolution thermique est influencée par la tectonique des plaques. Les résultats sont publiés dans la revue Nature (advanced online publication du 6 avril 2011).
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Blobrana


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There is no place on Earth that is a perfect copycat of Mars as it is now, or as it was at any specific point in the past. But scientists suggest Earth has little versions of Mars as it might have been over decades.
These places could help scientists develop a timeline of the Red Planet's history.
By providing insights on how Mars has changed over time, these terrestrial mimics could help us better understand the results of past and current missions to Mars. They also could help researchers plan future expeditions to look for signs of life on Mars. In addition, investigating these extreme sites on Earth could shed light on the limits of life.
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Blobrana


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Zumba Crater
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This animation shows Zumba crater on Mars. The camera is travelling at 100mph. The crater is approximately 600 meters deep and 2.8km in diameter.
The animation was created using NASA's HiRISE DTM and image data.
The image data resolution is 0.25 meters, the elevation data resolution is 1 meter.

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Blobrana


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Mars Carbon Dioxide
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Study Links Fresh Mars Gullies to Carbon Dioxide

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 of carbon-dioxide frost on the dunes. Before-and-after pairs that covered periods only in spring, summer and autumn showed no new activity in those seasons.
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Blobrana


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Eridania Planitia
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The International Astronomical Union (IAU) has approved the name Eridania Planitia for a 1025-km-wide low plain Martian feature located at 38S, 238W.
The feature was named in honour of the classical albedo feature name.

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Blobrana


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Martian Crater Tivoli
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The International Astronomical Union (IAU) has approved the name Tivoli for a 32.4-km-wide Martian crater located at 14.3S, 259.18W. The crater was named in honour of a town in Grenada.

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Blobrana


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Martian crater Vaduz
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The International Astronomical Union (IAU) has approved the name Vaduz for a 1.9-km-wide Martian crater located at 38.25N, 344.29W. The crater was named in honour of the Capital of the Principality of Liechtenstein.

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Blobrana


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The International Astronomical Union (IAU) has approved the name Milna for a 27-km-wide Martian crater located at 23.46°S, 12.31°W. The crater was named in honour of a town in the Republic of Croatia.

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Blobrana


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Martian crater Harris
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The International Astronomical Union has approved the name Harris for a 83-km-wide Martian crater located at -21.65S, 67.45°E. The crater was named in honour of the astronomer Daniel Lester Harris III (1919-1962).

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