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Chemistry, 18.07.2019 12:30 scottytohotty

How do scientists know that the universe is expanding? question 2 options: a) the doppler effect shows stars with red shifted light. b) the doppler effect shows stars with blue shifted light. c)the doppler effect shows stars with green shifted light. d)the doppler effect shows stars with yellow shifted light.

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How do scientists know that the universe is expanding? question 2 options: a) the doppler effect s...
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