J-P METSAVAINIO / SCIENCE PHOTO LIBRARY J-P METSAVAINIO / SCIENCE PHOTO LIBRARY
Sharpless 221 and 216. Sharpless 221 (left) is a supernova remnant in the constellation Auriga. Sharpless 216 (right) is an emission nebula in the constellation Perseus. Different colours represent different ionised gases; sulphur is red, hydrogen is green and oxygen is blue.
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