CHRIS BUTLER / SCIENCE PHOTO LIBRARY CHRIS BUTLER / SCIENCE PHOTO LIBRARY
Eta Cassiopeiae planet. Computer artwork of a hypothetical planet orbiting the Sun-like star Eta Cassiopeiae A (out of frame to the left). Eta Cassiopeiae is a binary (double) star, and the red dwarf star Eta Cassiopeiae B is seen at upper right. The binary star system lies around 18 years from Earth in the constellation Cassiopeia. This planet has liquid water (blue) and ice (white) on it surface.
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