Supernova remnant Cassiopeia A

Supernova remnant Cassiopeia A

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Caption: Supernova remnant Cassiopeia A. This is the remains of a star that exploded 325 years ago. When a large star dies, gas shells explode outwards and collide with interstellar material. The energy of the collision ionises the gas, causing it to glow. Cassiopeia A lies around 10,000 light years from Earth in the constellation Cassiopeia. Different colours represent different ionised gases; sulphur is red, hydrogen is green and oxygen is blue.

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Keywords: astronomical, astronomy, astrophysical, astrophysics, cas a, cassiopeia, cassiopeia a, expansion, explosion, false colour, gas shell, hst-palette, hubble palette, shells, snr, space, star death, stellar death, supernova remnant, telescope, young

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