How can it be that all galaxies and stars are moving away from each other yet they still collide? From what I have researched it as an open universe (or many open universes) yet the idea of stars and galaxies colliding boggles me.
The galaxies and stars are not all moving away from each other. The space between them is expanding, however this does not affect their trajectories. For instance the Andromeda Galaxy is set to cross paths with the Milky Way, after which we will join together as the unimaginatively named "Milkdromeda". As space expands it grows faster and faster, this will eventually lead to an "island effect", where the space between galaxies will expand faster than light, at which point everything outside our galaxy will go dark forever.