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