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from BBC News

'Rogue planet' spotted 100 light-years away

Astronomers have spotted a "rogue planet" - wandering the cosmos without a star to orbit - 100 light-years away. (via BBC News; image via ESO)

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Billions of stars orbit the center of our galaxy, and many of these stars have at least one planet orbiting them. But not all stars belong to a galaxy, and not all planets orbit a star. Rogue planets are worlds that drift untethered to any star, and experts estimate that there are billions of them in our galaxy alone.

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dyingsighs: “That one time Obi-Wan had to rescue 12 year old Anakin from an illegal lift-wing race in a Coruscanti garbage pit ~ Rogue Planet (x) ” | funny Star Wars

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there could be billions of rogue planets wandering the cosmos, unbound to any star. But they are likely to have been kicked out of their stellar systems through violent gravitational interactions, and in the process lost any accompanying moons. An apparently free-floating planet with a half Earth-mass moon would be a new class of system that was not previously known to exist. Such a new discovery would require strong evidence.

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