Question

Galaxy A is reported to be receding from our galaxy at a speed of 0.35c. Galaxy B, located in precisely the opposite direction to Galaxy A, is also found to be receding from us at a speed of 0.35c. What recessional speed would an observer on Galaxy A find (a) for our galaxy, and (b) for Galaxy B

Answer 1

Galaxy A is reported to be receding from us with a speed of 0.35c. Galaxy B, located in precisely the opposite direction, is also found