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How do stars form themselves?

Answer 1

The gravitational force created by the mass of gas pulls more gas in, the pressure eventually created enough heat to ignite the gas.

About 500 oC is the auto-ignition point of hydrogen, meaning that at that temperature, it would ignite even in the absence of an ignition source.

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Answer 2

Hazel Asher

Huge clouds of gas and dust known as nebulae are the source of stars. When areas within nebulae get dense enough, gravity pulls the regions inward, heating the gas and dust until it ignites nuclear fusion reactions, which forms a star.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.