The Life Cycles Of Stars
The Life Cycles of Stars
In the universe, there are hundreds of billions of stars. They are formed when gas and dust from space "clump" together. As the mass grows larger, gravity takes over and a core begins to form. The core becomes extremely dense and this compaction causes temperatures within it to rise to the point where nuclear fusion (the burning of hydrogen in a chain reaction) can begin. The heat generated by fusion can reach 24 million degrees F (Fahrenheit). "That amount of heat keeps the outer gas shell expanding while the ultra-dense core keeps from collapsing under its own gravity. The star is said to be in "equilibrium" or on the "main sequence". This is the point where a star spends most of its life." (Aspire.Cosmic-Ray.org, Stars, Main Sequence).
If in the formation of a star not enough heat is generated in the core to begin a fusion reaction, it is known as a Brown Dwarf. The stars core burns different gases or materials, but soon dies off to be a cold mass......
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