Ch 4 L2 Stars Vocabulary Review

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star

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A large ball of gas held together by gravity with a core so hot that nuclear fusion occurs.

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radiative zone

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A shell of cooler hydrogen above a star's core.

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convection zone

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Where hot gas moves up toward the surface and cooler gas moves deeper into the interior.

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photosphere

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The apparent surface of a star.

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chromosphere

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The orange-red layer above the photosphere.

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corona

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The wide, outermost layer of a star's atmosphere.

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sunspot

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A dark area of gas on the sun's surface that is cooler than surrounding gases.

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prominence

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A huge, reddish loop of gas that protrudes from the sun's surface, linking parts of sunspot regions.

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solar flare

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A sudden eruption of intense high-energy radiation from the sun's surface.

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Hertzsprung-Russell diagram

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A graph that plots luminosity vs. temperature of stars.