Phobos
Phobos is a small moon that orbits the planet Mars. It zips around Mars very quickly and looks like a lumpy rock.
A few interesting things
- Very small — only about 22 km across.
- Orbits very close to Mars and completes a circuit in less than one day.
- Slowly falling toward Mars and may break apart in millions of years.
A few details
- Diameter: 22 km
- Distance from planet: 9,377 km
- Orbit length: 0 days