With a diameter averaging about 7 miles, it's the smaller of Mars' 2 moons
The two small bodies that orbit the red planet are both smaller than Earth's ... 
Phobos has the closest orbit to its primary of any moon in the solar system, but 
still ... Deimos orbits much farther away, tending to stay 12,470 miles... [DOC] [TLE] Solar System Homework #1 Answers - Austin Community College [PAR] 1. a) Look up the mass of the Moon and the radius of the Moon in the book, ... 
Mars is at perihelion and Earth is at aphelion, how far apart are the two planets, 
in kilometers?