Star Composition

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What is star composition?

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Star composition refers to the elements and compounds that make up a star, primarily hydrogen and helium, along with trace amounts of heavier elements.

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NGSS.HS-ESS1-3

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What does redshift indicate about a star's movement?

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Redshift indicates that a star is moving away from the observer, as the light waves are stretched to longer wavelengths.

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NGSS.HS-ESS1-2

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What does blueshift indicate about a star's movement?

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Blueshift indicates that a star is moving towards the observer, as the light waves are compressed to shorter wavelengths.

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NGSS.HS-PS4-1

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What is an absorption spectrum?

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An absorption spectrum is a spectrum that shows dark lines or bands, indicating the absorption of specific wavelengths of light by elements in a star's atmosphere.

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NGSS.HS-PS4-4

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What is an emission spectrum?

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An emission spectrum is a spectrum that shows bright lines or bands, indicating the emission of specific wavelengths of light by elements in a star.

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NGSS.HS-PS4-1

NGSS.HS-PS4-3

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What is a continuous spectrum?

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A continuous spectrum is a spectrum that shows a complete range of wavelengths without any gaps, typically produced by solid, liquid, or densely packed gases.

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What is the Doppler effect in relation to stars?

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The Doppler effect is the change in frequency or wavelength of light from a star due to its motion relative to the observer, causing redshift or blueshift.

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NGSS.HS-PS4-1

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What is the significance of studying star spectra?

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Studying star spectra allows scientists to determine the composition, temperature, density, mass, distance, luminosity, and relative motion of stars.

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NGSS.HS-ESS1-3

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What does it mean if a star's light is shifted towards the red end of the spectrum?

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It means the star is moving away from the Earth.

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NGSS.HS-ESS1-2

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What is the relationship between redshift and the expansion of the universe?

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Redshift observations of distant galaxies indicate that the universe is expanding.

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NGSS.HS-ESS1-2