* Astronomy

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RE: Mars Reconnaissance orbiter

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HiRISE Images: 5 November 2008

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New images for 5 November 2008

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Small Crater on the North Polar Deposits (PSP_010180_2645)	Crater Floor Features (PSP_010057_2040)	Deep Rocks Unveiled at Bonestell Crater (PSP_010012_2225)
Inverted Channel in Miyamoto Crater (PSP_009985_1770)	Inverted Channel and Yardangs in Aeolis Mensae (PSP_009966_1735)	Ancient Layered Rocks in Nili Fossae (PSP_009929_2020)
Confluence of Valley and Crater (PSP_009669_1500)	Impact Crater amid the Deuteronilus Mensae (PSP_009654_2245)	Student Image of the Week: Ice Melting in Chasma Boreale during Northern Spring (PSP_007242_2650)

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HiRISE Images 29 October 2008

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New images for 29 October 2008

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Polygon Network and Scalloped Depressions in Western Utopia Planitia (PSP_010034_2250)	North Polar Layered Deposits and Dunes in Chasma Boreale (PSP_009905_2650)	Wall of Crater in Capri Mensa (PSP_009881_1670)
Lineated Valley Fill and Lobate Debris Aprons in Deuteronilus Mensae (PSP_009799_2205)	Rim of Elongated Crater (PSP_009665_1525)

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HiRISE Images: 22 October 2008

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New images for 22 October 2008

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Stair-Stepped Layered Exposed in Gale Crater (PSP_009927_1750) The origin of these thin, repetitive layers is unknown, but they likely reflect environmental changes that occurred while the layers were being deposited.	Fractures in Cerberus Fossae (PSP_009913_1910) The fractures formed tectonically, by movement of Mars crust.	Light-toned Layers West of Juventae Chasma (PSP_009842_1755) The walls of the troughalso exhibiting layering consisting of darker, thicker and blockier materialare shedding boulder-sized blocks down the slopes.
Fan in Holden Crater (PSP_009841_1530) This image shows a beautifully preserved alluvial fan located on the southern interior wall of Holden Crater.	Linear Dunes in the North Polar Region (PSP_009739_2580) Linear or longitudinal sand dunes are elongated, sharp crested ridges that are typically separated by a sandfree surrounding surface.	Layers in Crater Wall (PSP_009694_1545) These two craters show distinct bright layers around their rims. The crater on the top formed after the other, and its rim is sharp and less degraded, showing that it is younger.
Layered Shelf in Crater (PSP_009601_1920) Sediments form a bench with a flat top and steep edge along part of the interior wall. This site shows part of the steep edge of those deposits.	A Pair of Small Pit Craters (PSP_009488_1745) Cave environments can also protect organic life from extremely harsh conditions on the Martian surface, and may provide future human explorers with secure habitats.

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HiRISE Camera Reveals Rare Polar Martian Impact Craters
An odd, solitary hill rising part-way down an eroding slope in Mars' north polar layered terrain may be the remnant of a buried impact crater, suggests a University of Arizona planetary scientist who studied the feature in a new, detailed image from the HiRISE camera onboard NASA's Mars Reconnaissance Orbiter.
HiRISE, or the High Resolution Imaging Science Experiment, headed by Alfred McEwen of the Lunar and Planetary Laboratory, is based at the UA. New HiRISE images are posted weekly on the team's Web site.

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HiRISE Images: 15 October 2008

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New images for 15 October 2008

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Small Crater on Planum Boreum (PSP_009942_2645) The colour in the enhanced-colour example comes from the presence of dust and of ice of differing grain sizes.	Unusual Mound in North Polar Layered Deposits (PSP_009855_2625) One possible explanation for this anomaly is that it may be the remnant of a buried impact crater that is now being exhumed.	Layering in Uzer Crater Wall (PSP_009721_1785) On Mars, as on Earth, sedimentary rocks preserve a record of past environments.
Tell-Tale Rocks at Southern Acidalia Planitia (PSP_009708_2205) Tell-tale rocks at Southern Acidalia Planitia speak of a watery past.	Bacolor Crater Interior and Central Peak (PSP_009677_2135) Bacolor Crater is a pristine crater in the northern hemisphere.	Crater on North Polar Layered Deposits (PSP_009663_2635) The crater also contains a patch of bright ice despite being surrounded by terrain that has mostly lost its ice cover.
Fan in Aeolis Region (PSP_009623_1755) Although not all of the channels were active at once, this site clearly preserves a complex history, probably requiring thousands of years to form.