How big is Phobos?
22.2 km across · 13.8 mi
Mars’s larger moon averages about 22 kilometers across.
Mount Everest 8.8 km
Phobos 22.2 km
Compared with things you know
- Phobos is about 27× the height of the Burj Khalifa Burj Khalifa: 828 m
- Phobos is about 17× the length of the Golden Gate Bridge main span Golden Gate Bridge main span: 1.3 km
- Phobos is about 2.5× the height of Mount Everest Mount Everest: 8.8 km
- Phobos is about 1.0× the length of Manhattan Manhattan: 21.6 km
Think you could size it by eye? Phobos is one of the objects in Sizedle.
Similar space
- Olympus Mons 21.9 km tall 13.6 mi
- Halley's Comet nucleus 15 km long 9.3 mi
- Deimos 12.4 km across 7.7 mi
- Chicxulub impactor 10 km across 6.2 mi
- Meteor Crater 1.2 km across 3,937 ft
- Asteroid Ryugu 900 m across 2,953 ft