Phobos
The inner moon of Mars — doomed to spiral inward until it breaks apart into a ring, or crashes.
- Type
- Moon of Mars (inner)
- Diameter
- ≈22.2 km
- Rotation
- 7 h 39 min (synchronous)
- Orbit
- Orbits Mars at 9,376 km
- Discovered
- 1877 · Asaph Hall
- Visited by
- Viking · Mars Express · MRO · MMX (next)
Spiralling inward — in ~50 million years it will break up into a ring or crash into Mars.
