J-P METSAVAINIO / SCIENCE PHOTO LIBRARY J-P METSAVAINIO / SCIENCE PHOTO LIBRARY
Rosette nebula. This is an emission nebula, a huge cloud of gas and dust that glows as the hydrogen it contains is ionised by radiation from the hot young stars that have formed within it. The rosette nebula lies 5000 light years from Earth in the constellation Monoceros. Different colours represent different ionised gases; sulphur is red, hydrogen is green and oxygen is blue.
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