A fictional double planet, orbiting around the pair's center of mass, marked with a red dot. See more. 51 Eridani b
Artist's impression of the view from a (hypothetical) moon of planet HD 188753 Ab (upper left), which orbits in a triple star system.
Artist's illustration of the Epsilon Eridani system showing Epsilon Eridani and a Jupiter-mass planet
DOUBLE PLANET? OR, PLANET AND MOON? Earth-Moon is the next closest in mass, and the 2 orbit a spot over 913 miles underground, inside the Earth.
An artist's impression of the giant planet orbiting the binary system PSR B1620-26, which contains a pulsar and a white dwarf star and is located in the ...