Cave nebula

Cave nebula

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Credit: J-P METSAVAINIO/SCIENCE PHOTO LIBRARY

Caption: Cave nebula (Sharpless 155). This is an emission nebula, a huge cloud of gas and dust that glows as the hydrogen it contains is ionised by radiation from the hot young stars that have formed within it. The nebula lies in the constellation Cepheus. Different colours represent different ionised gases; sulphur is red, hydrogen is green and oxygen is blue.

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Keywords: 2-155, astronomical, astronomy, astrophysical, astrophysics, cave nebula, cepheus, emission nebula, false colour, hst-palette, hubble palette, sharpless 155, space, star birth, starbirth, stellar formation, telescope

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