How can stars burn without oxygen?

Answer 1

They are technically not burning.

Instead of referring to a star as a giant ball of flaming gas, it would be more accurate to describe it as a giant ball of nuclear fusion, as in a star, hydrogen atoms fuse with one another to form helium atoms. The release of enormous amounts of energy during nuclear fusion, some of which is converted to light, is what gives the appearance of burning.

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Answer 2

Mason Allen

Stars burn through a process called nuclear fusion, where hydrogen atoms combine to form helium. This fusion process releases a tremendous amount of energy, which generates heat and light. Oxygen is not necessary for this process to occur; instead, the extreme temperatures and pressures at the core of stars facilitate nuclear fusion.

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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.