phobos
/ˈfoʊbɑs/
noun
- The larger of the two moons of Mars, discovered in 1877.
- Phobos orbits Mars at a very close distance, only about 6,000 kilometers above the surface.
- Scientists believe Phobos will eventually crash into Mars or break apart into a ring.
- The Mars rover took a picture of Phobos passing in front of the Sun.