Suppose we look at two distant galaxies: Galaxy 1 is twice as far away as Galaxy 2. In this case,
A) Galaxy 1 must be twice as big as Galaxy 2.
B) we are seeing Galaxy 1 as it looked at an earlier time in the history of the universe than Galaxy 2.
C) we are seeing Galaxy 1 as it looked at a later time in the history of the universe than Galaxy 2.
D) Galaxy 2 must be twice as old as Galaxy 1.
Answer: B