Distant Galaxy A has a larger redshift than distant, but otherwise identical, Galaxy B.This means that Galaxy A
A) has a larger look-back time than Galaxy B.
B) appears to be bluer than Galaxy B.
C) appears to be brighter than Galaxy B.
D) is nearer to us than Galaxy B.
E) must be an elliptical-type galaxy if Galaxy B is also an elliptical-type galaxy.

Question

Quizplus · Accepted Answer

A larger redshift indicates that Galaxy A is moving away from us faster than Galaxy B, which implies it is further away and thus has a larger look-back time.

Distant Galaxy a Has a Larger Redshift Than Distant, but Otherwise