Supernova remnant Cassiopeia A

Supernova remnant Cassiopeia A

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Caption: Supernova remnant. Hubble Space Telescope (HST) image of Cassiopeia A. This is the remains of a star that exploded around 300 years ago. The out- rushing gas is colliding with the stellar medium, which causes a shock wave. This heats the gas to around 50 million degrees Celsius and causes it to emit X-rays. The bright dot at far right may be the neutron star or black hole left after the supernova explosion. The colours seen represent various chemical elements: blue is oxygen and red is sulphur.

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Keywords: astronomical, astronomy, astrophysics, cas-a, cassiopeia, cassiopeia a, cosmology, explosion, gas cloud, hst, hubble space telescope, science, snr, star, star death, stars, stellar, supernova remnant, universe, x-ray astronomy, xray

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