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Cassiopeia A as pictured by NASA's Chandra X-ray Observatory (Image: NASA/CXC/SAO)

spaceplasma: “Superfluid in Neutron Star’s CoreOne of the most famous astronomical objects in the night sky is the Cassiopeia A supernova remnant. This image of Cassiopeia A was taken with NASA’s.

After a massive star in the Milky Way exploded, it produced a shock wave of high-energy particles, seen here in purple. In the background, you can see stars as imaged by the Digital Sky Survey. Chandra captured data on the shock wave in 2003. It is estimated to be 2,400 light-years away.

Supernova Remnant X-rays from Chandra (purple) have been combined with optical data from the Digitized Sky Survey (red, green, blue)