Website review: APOD: 2007 August 5- The Dotted D...
MaiKeth discovered this in Astronomy
•2 reviews since Aug 5, 2007
astronomy, no-integrity, lazy-creeps
•antwrp.gsfc.nasa.gov/apod/ap070805.html
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whatsnews9 rated 12 months ago- great pictures. it shows that our universe is simply amazing and fascinating.
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- The Dotted Dunes of Mars in Nasa's Picture of the Day
The Dotted Dunes of Mars
Credit & Copyright: Malin Space Science Systems, MOC, MGS, JPL, NASA Explanation: What causes the black dots on dunes on Mars? As spring dawned on the Northern Hemisphere of Mars in 2004, dunes of sand near the poles begin to defrost. Thinner regions of ice typically thaw first reveali ng sand whose darkness soaks in sunlight and accelerates the thaw. The process might involve sandy jets exploding through the thinning ice. By summer, the spots expanded to encompass the entire dune s that were then completely thawed and dark. The carbon dioxide and water ice actually sublime in the thin atmosphere directly to gas. Taken in mid-July, the above image shows a field of spotted polar dunes spanning about 3 kilometers near the Martian North Pole. Today, the future of Mars rovers Spirit and Opportunity remains unkn own indy dust storms continue to starve them of needed sunlight. The Dotted Dunes of Mars Amazing how such images are opening our minds to ever evolving possibilities.
- The Dotted Dunes of Mars in Nasa's Picture of the Day
