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Jimmy9
- 4
- 0
Ive heard the space between galaxies grows over time and that the universe is expanding in every direction..ive also seen the balloon explanation were they make dots on a balloon and blow it up to demonstrate the expansion of the universe, if this is true how is it we have colliding galaxies? Something to do with galactic clusters? gravity? Differing velocities? The weakness of dark energy vs gravity at this stage?