Stars , Nuclear Fusion, and the Sun

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What is a protostar?

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A protostar is a stage in the formation of a star, where a cloud of gas and dust begins to collapse under its own gravity, leading to the formation of a dense core that will eventually become a star.

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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 a significant increase in size and a reddish color, occurring after the star has exhausted the hydrogen in its core.

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What is a star?

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An extremely hot ball of glowing gas, primarily composed of hydrogen and helium, undergoing nuclear fusion to produce energy.

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What is a nebula?

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A nebula is a vast cloud of dust and gas in space, often serving as the birthplace of stars.

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What is nuclear fusion?

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Nuclear fusion is the process by which two light atomic nuclei combine to form a heavier nucleus, releasing energy in the process, which powers stars.

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What is the main sequence?

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The main sequence is a continuous and distinctive band of stars that appears on plots of stellar color versus brightness, where stars spend the majority of their lifetimes fusing hydrogen into helium.

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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 has shed its envelope at the end of its life cycle, often appearing as a glowing shell of gas.

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What is a white dwarf?

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A white dwarf is a small, dense star that is the remnant core of a star that has exhausted its nuclear fuel and shed its outer layers.

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What is the role of gravity in star formation?

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Gravity plays a crucial role in star formation by causing clouds of gas and dust to collapse and form protostars.

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What happens during a supernova?

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A supernova is a powerful and luminous explosion that occurs at the end of a massive star's life cycle, resulting in the ejection of its outer layers and leaving behind a neutron star or black hole.