Ancient Volcanoes on Mars Hold Clues to Earth's Long-Lost Pa

For a quiet, dusty lump of a planet we see today, Mars has had a surprisingly violent history, one that could reveal some clues about Earth's own past.

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Mauna Loa , Hawaii , United States , Joseph Michalski , Robert Lea , University Of Hong Kong , Planetary Science Institute Aster Cowart , Hong Kong , Olympus Mons , Solar System ,