Redshift and the Big Bang - GCSE Physics

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How does the redshift prove that the universe is expanding?
There are three things that we know:
(1) Galaxies are travelling away from each other (receding).
(2) The entire universe is expanding from its initial singularity.
(3) The farther away a galaxy is from us, the faster it is receding.

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This really helped me with my exams thanks 😊

EkSugar
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The ATOMIC EMISSION SPECTRA will be shifted toward the red, the STAR will not change color and will not be red.

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