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Geography, 31.03.2020 20:33 uhhgray

How do scientists know that the universe is expanding?
1. The Doppler effect shows stars with yellow shifted light
2. The Doppler effect shows stars with green shifted light
3.The Doppler effect shows stars with blue shifted light
4. The Doppler effect shows stars with red shifted light
NEED HELP PLEASE ASAP

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How do scientists know that the universe is expanding?
1. The Doppler effect shows stars with...
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