Mars’ Doomed Moon May Be Hiding Evidence of an Ancient Catastrophe

Mars’ Doomed Moon May Be Hiding Evidence of an Ancient Catastrophe

Phobos’ hidden interior may hold the key to how Mars gained its strange inner moon. Phobos has circled Mars for billions of years, but scientists still do not know exactly how the small inner moon came to be. One possibility is that Mars captured it as an asteroid. Another is that Phobos formed from debris [...]