Global Warming on Mars

Not by Fire but by Ice


 Updated 25 September 2005      

Global warming on Mars  

- 21 September 2005 -Photographs from Nasa's orbiting spacecraft Mars Global Surveyor show recently formed craters and gullies.

At the same time, frozen carbon dioxide deposits near the Red Planet's south pole have shrunk for three summers in a row.

This is evidence, say NASA scientists, climate change is in progress.

The new gullies appear in an April 2005 image of a sand-dune slope. A previous shot from July 2002 had no trace of them.

Such gullies might have formed when frozen carbon dioxide, trapped by windblown sand during winter, vaporised rapidly in spring, releasing gas that made the sand flow as a gully-carving fluid, the team speculates.

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