Orion Nebula

Orion Nebula

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Credit: DR JUERG ALEAN/SCIENCE PHOTO LIBRARY

Caption: Orion Nebula. The Orion Nebula (M42; NGC 1976) is a huge glowing cloud of dust and gas, most of which is hydrogen, about 15 light years across and 1600 light years away. It is just visible to the naked eye as a luminous pink patch in the centre of Orion's sword. The gas is illuminated by ultraviolet radiation produced by a cluster of extremely hot, young stars in the centre of the nebula (not visible). The radiation ionizes hydrogen atoms, causing them to emit light of a distinctive colour. The Orion Nebula contains many sources of infrared radiation, which are thought to be sites of stellar formation.

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Keywords: astronomy, astrophysics, cosmology, cosmos, evolution, m42, nebula, night sky, orion, orion nebula, red, science, space, star birth, star formation, starbirth, stellar formation

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