GSC102 TEST 2 A ORIGIN OF THE UNIVERSE

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10 Terms

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Order of cosmic events

Universe begins (13.8 Ga) → atoms form as it cools → first stars → stars make heavier elements → winds/supernovae return elements to space

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Light from distant galaxies shifted to longer wavelengths

Redshift

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Faint radiation left from the hot early universe

Cosmic Microwave Background

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Spectral lines reveal...

What elements a star contains

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Color/wavelength of a star tells you...

Its temperature

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What pulled gas clouds together to form the first stars?

Gravity

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What happens inside stars at high temperature and pressure?

Nuclear fusion

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Heaviest element a massive star fuses

Iron

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How do elements heavier than iron form?

Slow or rapid neutron capture

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Why are stars essential for rocky planets?

They made heavier elements and returned them to space for later solar systems