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Nebulae can be the beginning or death of a star.

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The HR diagram shows that stars have life cycles

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Giant stars can have radii that are hundreds of times larger than the sun.

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Scientists believe that our Sun will develop into a planetary nebula in about five billion years.

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Vast majority of stars in the universe, including our Sun, are considered main sequence stars,

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A strong, rapid increase in the brightness of a star.

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A supernova remnant is the remains of a supernova explosion.

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Stars like the Sun become after they have exhausted their nuclear fuel.

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A massive explosion that occurs when a star dies.

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The birthplace of stars.

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Supergiants are among the most massive and most luminous stars.

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Black holes are among the most mysterious cosmic objects, much studied but not fully understood. These objects aren't really holes.