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| As hydrogen combines into helium, energy is released in a process called nuclear fusion. |
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| After a sunlike star forms, it enters the main sequence, the second and longest stage of its life cycle. |
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| The H-R diagram is a graph that shows the relationship between the surface temperature and absolute magnitude of a star. |
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| a supernova is a gigantic explosion in which a massive star collapses and its outer layers are blasted into space. |
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| Following a supernova, the center of the collapsed star may contact into a very small but very dense ball of neutron. This dense ball is called a neutron star. |
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| If a neutron star is spinning, it is called a pulsar. |
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| A black hole is an object that is so dense and massive that light cannot escape its gravity. |
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