A nova is a star that can suddenly increase in brightness and then suddenly fades. Supernovas are much rarer then novas. A Nova happens when a star runs out of energy and collapses in on its self. Supernovas often form black holes. A supernova is an explosion marking the end of a star. In the last few minutes of it's life the star releases more energy than it has generated in it's entire life. It brightens several billion times more than the sun. It radiates more energy than any other stars in the galaxy combined.
When a star like our sun reaches the end of its life it enters one last phase, ballooning up to many times it's original size. Astronomers call them giant red stars.
When a star like our sun reaches the end of its life it enters one last phase, ballooning up to many times it's original size. Astronomers call them giant red stars.
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