galaxies. These events take place when massive stars end their life. The stellar
core collapses and they blow off their outer layers. The only thing which remains
of the exploded star is a high density neutron star, which may manifest itself
as a pulsar, or possibly a black hole.
Supernova remnants can be observed from radio frequencies up to X-ray frequencies.
Probably the best
examples for the composite remnants are 0540 in the Small Magelanic Cloud,
and MSH15-56 in the Galaxy
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