What happens when stars die?

Answer 1

There are two ways in which a star dies. Namely a supernova as mentioned by @Leonardo and a formation of a planetary nebula,

A star dies via a supernova if it is a massive star, many times bigger than our sun. (These stars have a relatively short life span compared to smaller stars)

After the supernova, a black hole is formed or a neutron star is created.

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Answer 2

Maya Adams

When stars die, their fate depends on their mass. Low to medium-mass stars, like the Sun, eventually swell into red giants, shed their outer layers, and form planetary nebulae. The remaining core becomes a dense white dwarf. High-mass stars undergo supernova explosions, leaving behind neutron stars or black holes.

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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.