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Biology, 08.11.2019 01:31 kittey7854

How do you scientist know that the universe is expanding

a the doppler effect shows stars with yellow shifted light
b the doppler. effect shows stars with blue light
c the doppler. effect shows stars with red shifted light
d the doppler effect shows stars with green light

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How do you scientist know that the universe is expanding

a the doppler effect shows star...
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