Intergalactic travel is impractical using robotic spaceships because the electromagnetic radiation in space is pointed at you, and is blue shifted to enormous energies and will just kill you. Also there is the problem of interstellar gas and micrometeorites that could vaporize your spacecraft travelling at thousands of mph.

 

You could use a space ship made of an enormous piece of ice and that would shield you from most hazards, but eventually EM radiation would get you anyway.

 

Assuming short cuts like worm holes are impossible to exploit, the only solution is to transcend physical form altogether. Maybe there is a science beyond physics which will allow us to transcend physical form altogether.

 

I'm hoping that's what will happen when I die.

 

http://www.physicsforums.com/showthread.php?t=4858&page=2

Edited June 19, 201213 yr by seriously disabled

Hm, the necromancy is strong with this one.