May 11, 2010 Geek Out!: Stephen Hawking and five ways to travel in timePosted: 01:31 PM ET
![]() Editor's note: Geek Out! posts feature the latest and most interesting in nerd-culture news. From scifi and fantasy to gadgets and science, if you can geek out over it you can find it on Geek Out! Look for Geek Out! posts on CNN's SciTech blog. Stephen Hawking's new Discovery Channel series, "Into the Universe," aired again last night and continues into next week. In it, the famed cosmologist discusses the mathematical probability of aliens, the Big Bang and time travel. Hawking's theories on time travel in particular seem fairly optimistic - although "Back to the Future"-style DeLoreans are conspicuously absent. That will be the topic next week. Taking a cue from the show, here are five semi-practical models of time travel: Barrel through a wormhole The caveat, of course, is that we'd be facing heavy radiation feedback concerns (a bit like the screeches you hear at rock concerts) and even without that problem, that we would create paradoxes by messing around with historical events in the past. For this reason, Hawking believes travel to the past may well be impossible. Go near a black hole Go really, really fast Live on a space station Become a Retronaut Posted by: Nicole Saidi -- CNN iReport Senior Associate Producer
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