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Question
(a) What is the approximate speed relative to us of a galaxy near the edge of the known universe, some 10 Gly away? (b) What fraction of the speed of light is this? Note that we have observed galaxies moving away from us at greater than $0.9c$.
1. $2.0\times 10^{5}\textrm{ km/s}$
2. $0.67$
Solution Video