Trifid Nebula

Trifid Nebula

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Credit: DR LUKE DODD/SCIENCE PHOTO LIBRARY

Caption: Trifid Nebula (M20, NGC 6514), optical image. Part of this nebula (cloud of gas and dust) glows red due to the ionisation of the hydrogen gas by the hot and bright stars born at its centre. This is called an emission nebula. The M20 emission nebula is partially obscured by a dark nebula (B85) in front of it, causing the three-lobed appearance. The M20 nebula is not all ionised, with parts of it reflecting starlight as a blue colour (right). The Trifid Nebula lies around 9000 light years from Earth in the constellation Sagittarius.

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Keywords: astronomical, astronomy, astrophysical, astrophysics, dark nebula, dust, emission nebula, gas, ionised hydrogen, longer exposure, m20, nebula, ngc 6514, night sky, optical, reflection nebula, sagittarius, space, telescope, trifid nebula, universe, visible

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