CELESTIAL IMAGE CO. / SCIENCE PHOTO LIBRARY CELESTIAL IMAGE CO. / SCIENCE PHOTO LIBRARY
Star HD 161840 and emission nebula RCW 134. True- colour optical image of the star HD 161840 with the emission nebula RCW 134 (pink, upper centre) in the constellation Scorpius. Emission nebulae are huge clouds of interstellar gas and dust which emit light due to ionisation of their hydrogen gas by radiation from hot young stars embedded in them. This image was produced by digitally combining photographs taken by the UK Schmidt Telescope in blue and red light.
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