CHRIS BUTLER / SCIENCE PHOTO LIBRARY CHRIS BUTLER / SCIENCE PHOTO LIBRARY
Barnard's Star planet. Computer artwork of a hypothetical planet in orbit around Barnard's Star (lower left). Barnard's Star is a red dwarf star in the constellation Ophiuchus. It lies just under six light years from Earth, making it one of the closest stars to us. This planet is so close to the faint, cool star that its orbit has become locked. This means that one side of the planet always faces the star and the other side always faces away from it. This causes a large temperature difference on the planet, and an extensive ice cap (white) is seen on its dark side.
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