Question

How does a nebula change into a protostar?

Answer 1

Nebula:-

It is combination of clouds of gas and dust.There are hydrogen gas and Hydrogen atoms present. Due to gravity hydrogen gas start to clumpse together and the atoms will start to spin and it pulls up more hydrogen atoms that causes into collision. Collision of hydrogen atoms causes the hydrogen gas to heat up. When the temperature reach 15,000,000C, nuclear fusion starts. A protostar is then formed.

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Answer 2

It is the combination of dust and clouds.