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A supernova is the explosion of a star. A supernova releases huge amounts of energy, which is why you can see it glowing brightly in this 1997 NASA image of a supernova in a distant galaxy.
In AD 1054, for a period of about two weeks, a supernova in our own galaxy glowed so brightly it could be seen even during the daytime. This petroglyph, found near Peñasco Blanco at Chaco Canyon, is thought by some to be a representation of this spectacular cosmological event.