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A black hole is a region in space where gravity is so strong that nothing, including light, can escape

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A supernova is a star's massive explosion. It can occur when a massive star runs out of fuel and explodes, or when a white dwarf star in a binary star system explodes.

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a star that suddenly increases its light output tremendously and then fades away to its former obscurity in a few months or years

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Giant stars are stars that are much larger and brighter than other stars of the same color

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A supergiant is a star that is extremely large and luminous, and can be several hundred times larger than the sun

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A white dwarf is a star that has reached the end of its life and is the core of a dying star that has run out of nuclear fuel

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A "main sequence star" is a star that is currently fusing hydrogen into helium in its core

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A Hertzsprung-Russell (H-R) diagram is a graph that shows the relationship between the luminosity and temperature of stars

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A diffuse nebula is a thin, widespread cloud of gas and dust in space that has no clear boundary and is often detected by the light of nearby stars.

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the debris left behind after a star explodes in a supernova

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A planetary nebula is a glowing cloud of gas and dust that forms when a star dies:

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A nebula is a giant cloud of gas and dust that floats in space between stars.