J-P METSAVAINIO / SCIENCE PHOTO LIBRARY J-P METSAVAINIO / SCIENCE PHOTO LIBRARY
Supernova remnants Sharpless 223 (bottom) and 224 (top). When a large star dies, gas shells explode outwards and collide with interstellar material. The energy of the collision ionises the gas, causing it to glow. They lie in the constellation Auriga. Different colours represent different ionised gases; sulphur is red, hydrogen is green and oxygen is blue.
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