The Life of a Star

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Every star has a cycle: a beginning, middle, and an end.

Beginning

A star has its begging deep inside a massive cloud of interstellar gases and dust called a nebula. A nebula consists primarily of hydrogen and helium. Stars are formed when parts of nebulas collapse in on themselves.

When a nebula reaches a certain density, gravitational forces begin to pull the gas and dust particles close together, causing clumps to form inside the main cloud of the nebula. As the dust and gas particles are down in, they become more massive and have a stronger gravity. This process is forming a protostar.

As the mass and gravity of a protostar increase, it becomes a tightly packed sphere of matter, drawing more and more matter into its core. The force of gravity eventually causes the atoms in the core of the protostar to become so tightly packed that the pressure in the core rises and nuclear fusion begins