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A giant crater may reveal the origin of Mars' doomed moon

Scientists are diving deep into one of planetary science's biggest mysteries - where did Phobos, Mars' strange little moon, actually come from? The key might be hidden in Stickney Crater, an enormous impact scar that could tell us whether Phobos formed from debris blasted into orbit by a giant collision with Mars, or whether it was captured as a wandering asteroid billions of years ago. Researchers are now studying Phobos' gravity and internal structure to figure out how dense it really is and whether it contains water ice - clues that could settle this debate once and for all. What's fascinating is that Phobos survived such a massive impact at all, suggesting it might have an unusually spongy, low-density interior that absorbed the blow like a cosmic cushion.
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