If the universe was created by a big bang as we are told, why are galaxies colliding? Shouldn’t they be moving out from a central point away from each other? Do some galaxies have “english” as in billiards and move in an arc? I will never make it as an astronomer.
Nearly all galaxies ARE moving away from every other galaxy. However, some galaxies happened to form close enough to each so that the force of gravity counteracts the universal expansion and pulls them together. On the larger scales, universal expansion easily wins out. Gravity effects are local.
There are also other strange things, where entire groups of galaxies are moving off (together) against the general universal expansion flow. Look up “Deep Flow”. Also “The Great Attractor”.