In astronomy, double planet and binary planet are informal terms used to describe a binary system where both objects are of planetary mass. Though not an official classification, the European Space Agency has referred to the Earth–Moon system as a double planet. The IAU General Assembly in August 2006 considered a proposal that Pluto and Charon be reclassified as a double planet, but the proposal was abandoned.
There are also binary asteroids (also known as double minor planets) such as 90 Antiope, and binary Kuiper belt objects (KBOs) such as 79360 Sila–Nunam and 1998 WW31.
Read more about Double Planet: Definition of A Double Planet, Double Planets in Fiction
Famous quotes containing the words double and/or planet:
“No slavery can be abolished without a double emancipation, and the master will benefit by freedom more than the freed-man.”
—Thomas Henry Huxley (1825–95)
“It was not important that they survive.
What mattered was that they should bear
Some lineament or character,
Some affluence, if only half-perceived,
In the poverty of their words,
Of the planet of which they were part.”
—Wallace Stevens (1879–1955)