Lighter-toned bedrock that surrounds fractures and comprises high concentrations of silica--called "halos"--has been found in Gale crater on Mars, indicating that the planet had liquid water much longer than previously believed. The new finding is reported in a paper published today in Geophysical Research Letters, a journal of the American Geophysical Union.
Lighter-toned bedrock that surrounds fractures and comprises high concentrations of silica--called "halos"--has been found in Gale crater on Mars, indicating that the planet had liquid water much longer than previously believed. The new finding is reported in a paper published today in Geophysical Research Letters, a journal of the American Geophysical Union.
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