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How does a supernova form?

Answer 1

When nuclear fusion stops.

When the nuclear fusion of a massive star stops, it means that all of its core is mainly Iron. Then the iron atom, instead of releasing energy, it absorbs it. After a while, the energy absorbed will be released and causes an explosion called a supernova

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Answer 2

Owen Atkinson

A supernova is created when a massive star exhausts its nuclear fuel and collapses due to gravity; this massive explosion releases an enormous amount of energy and expels the star's outer layers into space.

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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.