The Earth-Moon System . ... Credit Copyright: NASA, JPL, Galileo Project Explanation: A double planet? From 4 million miles away on December 16, 1992, NASA's robot spacecraft Galileo took this picture of the Earth-moon system. ... Our moon is one of the largest moons in the solar system. It is even larger than the planet Pluto. In this picture, the Earth-moon system actually appears to be a double planet. For more information see NASA, Jet Propulsion Laboratory press release. ...