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Supernova Remnants
Crab Nebula

Supernova Remnants (SNRs)

Supernova remnants (SNRs) are the ejected debris of supernova explosions from dying or dead stars. SNRs form expanding shells, bows, or bubbles of highly-engergized gas and interstellar material that are swept up in the shock wave. Supernovae generate most of the heavier elements in the periodic table as a result of the intense pressures and temperatures from the explosion. Supernovae are of two primary types:

Type Ia supernova - caused by exploding white dwarf stars after they feed too much from a binary companion star over time until they reach critical mass. Often the white dwarf is obliterated afterward.

Type II supernova - caused by the gravitational core-collapse of high-mass stars that stop generating fusion in the core, collapsing inward under gravity, then exploding outward, leaving a neutron star or black hole.