"Without the development of genuinely sci-fi travel technology like wormholes or hyperspace (which may not even be possible) 99.99+% of the universe will be forever locked off from us.
Because of cosmic expansion, the various galactic clusters are moving away from our local cluster faster than we could ever catch up to them."
Just look up "cold welding," dummy. Maybe you'll learn something today.
Is cold welding in space real?
Don't worry, though, cold-welding in space, despite the seeming ease of it, doesn't happen very often. Typically, all metals launched into space have a thin coating of oxidation on them due to contact with the Earth's atmosphere. Once in orbit, the coating is usually still present, so cold-welding doesn't occur.