Imagine that the universe is a solid ball with galaxies scattered all through it from the center to the edge. Suppose the galaxies stay the same size, but the ball gets bigger. What will happen to the distance between the galaxies?
A.
The distances between only the galaxies on the surface of the ball will increase.
B.
The distances between the galaxies near the center of the ball will decrease.
C.
The distances between all the galaxies will increase throughout the ball.
D.
The distances between the galaxies will change randomly depending on the galaxies' motion.
1 answer
The correct answer is:
C. The distances between all the galaxies will increase throughout the ball.
In the analogy of the expanding universe as a solid ball, if the ball gets bigger, the distances between all the galaxies will increase, regardless of their initial position within the ball. This represents the expansion of space itself, which causes galaxies to move away from each other as the universe expands.
