Supernova

A supernova occurs when a star explodes. From the earth, people can see a new start appear in the sky and then fade over months back to invisibility. Such explosion can be exploded can be caused by a massive star near the end of its life collapsing into a black hole or neutron star or a dead star; a white dwarf, collapsing into a neutron star. At the turn of the 19th century, the binary star system Eta Carinae was faint and undistinguished. In the first decades of the century, it became brighter