The birth and evolution of the stars depends on their mass. They are formed from a nebula that is composed of dust particles and hydrogen gas. Gravity binds this material into globules, whose centers are heated until hydrogen begins to become helium by nuclear reactions.
After tens of millions of years, the central star, with more mass, begins to deplete its nuclear fuel and explodes like a supernova, leaving behind it a pulsar. After about ten billion years. A star with less mass, also begins to reach the end of its life. This core collapses, forming a planetary nebula.
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