J-P METSAVAINIO / SCIENCE PHOTO LIBRARY J-P METSAVAINIO / SCIENCE PHOTO LIBRARY
Crescent nebula (bubble-like structure, upper centre). The nebula is a glowing shell of gas cast off by the central star WR 136. WR 136 is a Wolf-Rayet star, a rare type of hot, massive star that loses mass rapidly through a strong and dusty stellar wind. This nebula lies around 4700 light years from Earth in the constellation Cygnus. Different colours represent different ionised gases; sulphur is red, hydrogen is green and oxygen is blue.
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