View Full Version : Green Minerals on Mars Say it's Dry

2005-Sep-11, 05:06 AM
SUMMARY: Astronomers have uncovered a green mineral on Mars called olivine that could indicate that the planet has been completely dry for at least a billion years, since the mineral was exposed to the Martian air. Olivine is found in many rocks on Earth, and it's highly susceptible to chemical weathering. If liquid water was present at any time in the past, the olivine would have altered into other materials - but this hasn't happened. The areas will be further investigated in 2005 by the upcoming Mars Reconnaissance Orbiter, which has 100 times the resolution of the Mars Global Surveyor.

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