(a) Explain how redshift leads to the idea that the Universe is expanding.
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(b) Stars in a distant galaxy emit radiation. The total luminosity of the stars in the galaxy is
Question
Physics
CAIE2024
(a) Explain how redshift leads to the idea that the Universe is expanding.
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
...................................................................................................................................................
............................................................................................................................................. [3]
(b) Stars in a distant galaxy emit radiation. The total luminosity of the stars in the galaxy is