Exit Check 8.6: Life Cycle of Stars

Front

What is a black hole?

Back

A black hole is a region in space where the gravitational pull is so strong that nothing, not even light, can escape from it. It is formed when a massive star collapses under its own gravity after a supernova.

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What initiates the birth of a star?

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A star is born when nuclear fusion starts in its core, which occurs after a nebula condenses into a protostar.

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What will our sun become in 4 to 6 billion years?

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Our sun will become a red giant as it exhausts its hydrogen fuel and expands.

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What determines a star's life expectancy?

Back

A star's life expectancy primarily depends on its mass; more massive stars have shorter lifespans.

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Can our sun become a black hole?

Back

No, our sun's mass is too low to create a black hole. It will expand into a planetary nebula and then become a white dwarf.

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What is a neutron star?

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A neutron star is the remnant core of a massive star that has undergone a supernova explosion, consisting mostly of neutrons and having a very high density.

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What is a supernova?

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A supernova is a powerful and luminous explosion that occurs at the end of a star's life cycle, often resulting in the formation of a neutron star or black hole.

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What is a red giant?

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A red giant is a late stage in the life cycle of a star, characterized by its large size and reddish color, occurring after the star has exhausted its hydrogen fuel.

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What is a planetary nebula?

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A planetary nebula is an astronomical object formed from the outer layers of a star that are expelled during the later stages of its evolution, often surrounding a white dwarf.

Front

What is nuclear fusion?

Back

Nuclear fusion is the process by which two light atomic nuclei combine to form a heavier nucleus, releasing energy, and is the primary source of energy for stars.