The Crater That Could Settle Where Phobos Came From
A giant crater on Mars' moon Phobos may hold the evidence needed to decide if it's a captured asteroid or Mars debris.
Rovers, orbiters, and the case for and against going.
A giant crater on Mars' moon Phobos may hold the evidence needed to decide if it's a captured asteroid or Mars debris.
Landing is solved. Launching off the surface and rendezvousing in Mars orbit has never been done.