CHRIS BUTLER / SCIENCE PHOTO LIBRARY CHRIS BUTLER / SCIENCE PHOTO LIBRARY
Eclipsing binary star system. Artwork of W Ursae Majoris, an eclipsing binary system located around 200 light years away from Earth. The two component stars (orange/white) are similar in brightness and are almost in contact. The total brightness of the system varies on a regular cycle, because the orbital paths of the stars causes them to pass in front of one another when viewed from Earth.
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