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
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.