A nebula is a cloud of gas that surrounds a star that has exploded in a supernova. So it is essentially the remnants of a star that has died.

A quasar is an extremely active black hole in the centre of a galaxy that spews out EM radiation.

A red giant is a star that has reached the end of the main phase the envelope of the star is inflated which is what makes them giant.

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Tarik Zegmott
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