Supernovae at different times in their "life".
Crab Nebula (M1) located in Taurus at SN 1572 and SN 1604. It can be observed by the naked eye in the Milky Way galaxy and is around one thousand years old. The Crab Nebula is a supernova remnant.
"The nebula was observed by John Bevis in 1731; it corresponds to a bright supernova recorded by Arab, Chinese and Japanese astronomers in 1054. At X-ray and gamma-ray energies above 30 keV, the Crab is generally the strongest persistent source in the sky".
"After" and "Before" pictures of Supernova 1987A
Supernova 1987 is located in the Large Magellanic Cloud. The picture taken below came from the Hubble Space Telescope and uses far-reaching ultraviolet technology. While we saw the light in 1987 the actual explosion occurred some 160,000 years ago.
Supernova SN 2006bc is located in the galaxy NGC 2397, 60 million light years away from Earth, a classical spiral galaxy very similar to our own, which allowed Hubble to study individual stars inside it in great detail. The constellation that it occupies is Carina the Sail and the name we know it by is Eta Carinae. The age is undetermined but it is believed that Eta Carinae will collapse into a black hole within a million years.
Supernova remnant Cassiopeia A is located in the constellation Cassiopeia, which is also in the Milky Way galaxy. The colored X-ray image showing silicon ion concentration in the supernova remnant Cassiopeia A (Cas A). These colors represent the intensity of X-ray emission, from green (lowest) through magenta to yellow (highest). Cas A is the remains of a star which exploded as a supernova around 300 years ago. It blew up around the year 1667; the celestial object was not noticed till August. 16, 1680 by John Flamsteed.
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