Supernova remnant Cassipeia

Supernova remnant Cassipeia

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Caption: X-ray image of the supernova remnant Cassiopeia A (3C 461), taken with the Einstein Observatory X- ray satellite. Cassiopeia A is the remnant of a catastrophic stellar explosion, or supernova, which occured approximately 300 years ago. The X- ray emission comes from a spherically expanding cloud of gas expelled by the explosion. As the gas travels outwards, it collides with the surrounding interstellar medium, forming a shock front. This heats the expanding gas to temperatures of 10 to 50 million degrees, causing it to emit X-ray radiation.

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Keywords: 3c 461, astronomy, cas-a, cassiopeia a supernova remnant, cosmology, einstein observatory imagery, science, snr, star death, stellar, supernova, supernova remnant, x-ray astronomy, xray

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