View Full Version : Discussion: Gullies on Mars Not Formed by Water?

2004-Jan-13, 02:11 AM
SUMMARY: Gullies on Mars were discovered in 2001 that seemed to show evidence that liquid water had been on the surface of the planet very recently. But a theory from a University of Melbourne geologist examines the possibility that the gullies were carved by an avalanche of carbon dioxide changing directly from a solid to a gas. This theory has been met with skepticism from other Mars researchers, who are hoping that liquid water might someday be found on Mars, increasing the possibility of finding life.

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2004-Jan-13, 02:13 AM
How could anyone tell the difference without direct measurements?