19)
Why were collisions much more likely early in time (closer to the birth of the universe) than present day?
A)
galaxies were closer together
B)
galaxies were bigger in earlier times
C)
there were only spiral galaxies which tend to collide more often
D)
early galaxies had no more protogalactic clouds which formed more stars
to collide
Universe was smaller and galaxies were closer together in past, galaxy collisions were common in past (distorted galaxies were common in early universe).
