Problem 4 The galaxy Hydra is reported to be moving away from the Earth with a velocity of 0.45c. The galaxy Cygnus, which is located in precisely the opposite direction, is also found to be moving away from the Earth at the same speed (0.45c). (a) What would a person on Hydra measure for the velocity of recession for the Earth? i.e. Relative to Hydra, at what velocity is the Earth receding? (b) What would a person on Hydra measure for the velocity of recession of the galaxy Cygnus