Biology, 23.04.2020 07:02, aksambo4707

How do scientists know that the universe is expanding?
The Doppler effect shows stars with yellow shifted light
The Doppler effect shows stars with green shifted light
The Doppler effect shows stars with red shifted light
The Doppler effect shows stars with blue shifted light

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