Interstellar planets — those without stars to orbit — could serve as havens for life, according to a new study.
They are often thought to be nearly invisible, since they are much dimmer than stars and do not have any suns nearby to illuminate them. Now, however, research suggests these worlds might be detected by their auroras. [Gallery: The Strangest Alien Planets]
Interstellar planets might either be rogue planets that were originally born around a star and were later cast out by gravitational tugs of war, or sub-brown dwarfs that formed alone in interstellar space. Scientists have suggested that interstellar planets could support life under or even on their surfaces.
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