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7 November, 09:03

What evidence indicates that the universe is expanding?

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  1. 7 November, 11:54
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    redshift and doppler effect

    redshift is an increase in the wavelength of radiation emitted by a receding celestial object as a consequence of the Doppler effect and the Doppler effect is a tool used to measure frequency changes as light travels to, from, or pass an observer
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