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Black holes are invisible to the eye because they are as lightless as the space around them.

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One supergiant can be as bright as a million Suns. The colour of supergiants can be red or blue.

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Diffuse nebula are the clouds of material formed from the explosions of population three, population two stars, and the left over hydrogen and helium from the Big Bang.

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Supernovae are considered one of the original sources of the elements heavier than iron in the Universe.

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White dwarfs can have temperatures exceeding 100,000 Kelvin, or about 179,500 degrees Fahrenheit.

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They are the main source of most heavy elements, from oxygen on up.

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A nova is a star that temporarily increases in brightness, but it's not actually a new star.

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A main sequence star shining in the night sky

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Main sequence stars make up around 90% of the universe's stellar population.

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There are believed to be about 20,000 objects called planetary nebulae in the Milky Way Galaxy

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Over time, as the outer layers of the star expand, gravity causes its core to shrink and contract.

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It is a very useful graph because it can be used to chart the life cycle of a star.

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Nebulae are made of dust and gases—mostly hydrogen and helium.