In 1953, Fritz Leiber published The Wanderer, about a planet that moved through interstellar space, without a sun to orbit. Scientists have now announced the discovery of PSO J318.5-22, a gas giant located 80 light years from Earth that does not orbit a primary. With only six times the mass of Jupiter, the planet is believed to be 12 million years old, relatively young for a planet. The lack of a primary makes it easier for scientists to study the planet.
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