2 Galaxies, Special Relativity, 4 Possible Alternatives
Galaxy A is moving away from Earth with a speed of 0.45 c. Galaxy B, located in the diametrically opposite direction, is moving away from us with the same speed. What multiple of c corresponds to the rate of recession measured by an observer from galaxy A to galaxy B?
a) +0,95 c
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c) -0,622 c
d) -0,689 c
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