J-C CUILLANDRE / CANADA-FRANCE-HAWAII TELESCOPE / SCIENCE PHOTO LIBRARY J-C CUILLANDRE / CANADA-FRANCE-HAWAII TELESCOPE / SCIENCE PHOTO LIBRARY
Lagoon Nebula coloured optical image. This nebula (M8, NGC 6523) is a large starbirth region of gas and dust that lies around 3500 light years away, in the constellation Sagittarius. Its red glow is due to ionisation of hydrogen gas by radiation from hot young stars within it. Photographed by the Canada-France-Hawaii telescope on Big Island, Hawaii.
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