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What happens to a massive star after the main sequence?
It can become a supergiant.
What is a supergiant?
A very large, bright massive star in a late stage of its life.
What is a supernova?
A powerful explosion associated with the death of a massive star.
What can be left behind after a supernova?
A neutron star or black hole.
What is a neutron star?
An extremely dense leftover core of a massive star.
What is a black hole?
An object formed by extreme gravitational collapse, with gravity strong enough that light cannot escape from within its event horizon.