ADAM BLOCK / MOUNT LEMMON SKYCENTER / UNIVERSITY OF ARIZONA / SCIENCE PHOTO LIBRARY ADAM BLOCK / MOUNT LEMMON SKYCENTER / UNIVERSITY OF ARIZONA / SCIENCE PHOTO LIBRARY
Red Rectangle Nebula. Optical image of the Red Rectangle Nebula (HD 44179), so-called because of its red colour and unique rectangular shape. This protoplanetary nebula lies around 2300 light years from Earth, in the constellation Monoceros and hosts a binary star system at its centre.
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