A large crater on Mars' moon Phobos may contain compressed material that could settle whether the moon is a captured asteroid or debris from an ancient impact on Mars. Japan's MMX sample return mission could provide the decisive measurements.
Massive Crater on Phobos May Reveal Moon's Origin
A large crater on Mars' moon Phobos may contain compressed material that could settle whether the moon is a captured asteroid or debris from an ancient impact on Mars. Japan's MMX sample return mission could provide the decisive measurements.
Deimos (moon) · Wikimedia — licence per file · rights
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