I read an article about Time Travel once... somewhere on the vast internets. It explained and proposed that if we perfected the science of freezing people and reanimating them then we'd be able to time travel - only forwards though.
The trip into the future would seem instantaneous and with this technology we'd be able to explore distant solar systems and galaxies. That's the only way to travel through space as it would take hundreds.. thousands... millions of years to travel anywhere - therefore we must time travel there!
The article was oh so fascinating and I wish I could find it again. There were many problems and the writer addressed all the ones he could think of... like maintaing a spaceship which holds your frozen time traveling body for years and years. And communication between other time travelers.
Anyways, before I ramble on about robots (yes, we need robots) for time travel I'll leave you with the "Time Travel" adventure with Triangle Dude.