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Answer:
A star begins its life as a cloud of dust and gas (mainly hydrogen) known as a nebula. A protostar is formed when gravity causes the dust and gas of a nebula to clump together in a process called accretion. ... If a critical temperature in the core of a protostar is reached, then nuclear fusion begins and a star is born.
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Explanation:
A star begins it's life cycle as a nebula, or rather, a cloud of dust and gas! Turbulence deep within these clouds of gas, causes knots to form. The gas and dust begin to collapse under its own gravitational attraction. As the cloud collapses, the material at the centers begins to heat up, forming a protostar!
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