Mars and Moon: Not Dead Yet?
Their thinking goes that Mercury, Mars, and the Moon were once quite hot and and their interiors partially molten. However, since all three are much smaller than Earth, they all cooled off long ago. No heat source, no geologic activity. (The jury is still out on Venus, whose clouds hide its surface from view.)
But the Moon and Mars might not be completely dead, according to what's turned up recently in super-high-resolution detailed closeups from orbiting spacecraft.
Glenn A. Walsh, Project Director,
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