Astronomers infer that the universe is expanding because distant galaxies all appear to
A) be growing in size.
B) be moving away from us, with more distant ones moving faster.
C) be made mostly of dark matter.
D) rotate rapidly.
Answer: B
Astronomers infer that the universe is expanding because distant galaxies all appear to
A) be growing in size.
B) be moving away from us, with more distant ones moving faster.
C) be made mostly of dark matter.
D) rotate rapidly.