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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
If time itself is a dimension like length and height and width, then Hawking says the fabric of time contains imperfections we could take advantage of. A smooth billiards ball has microscopic crevices, and so does spacetime. We'd need to find a true "wormhole" and prop it open, and then head on through.
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
It's simple: All we have to do is find a supermassive black hole and get into its orbit without being sucked into it. Hawking says time would slow down for the people in orbit relative to people elsewhere. Now to find a black hole ...
Go really, really fast
Hawking says if we can get close to the speed of light, a "cosmic speed limit" will kick in to prevent going any faster. Approaching roughly 186,000 miles per second, time will slow down for the traveler vs. the observer. When the traveler emerges, they will have jumped into the future. We just have to develop an engine that can go that fast. Don't try this on the Autobahn, folks.
Live on a space station
Turns out Cosmonaut Sergei Avdeyev is said to hold the record for the most time traveled into the future: about 20 milliseconds. His cumulative experience aboard Russian space station Mir gave him an edge over the competition. Hawking discusses in his documentary how orbiting global positioning satellites must have their timekeeping adjusted every so often because of the relative time slowdown.
Become a Retronaut
This one might be a cop-out, but many scientists (including Hawking) argue that time travel to the past is paradoxical and potentially impossible. In lieu of a Wayback machine, we can turn to the work of Chris Wilds, who created a website about his experiments with being a being a Retronaut. That is, a person who travels into the past by exploring perceptions of time. Whether by looking at old pictures juxtaposed with new ones (which we experimented with at CNN iReport a few weeks ago) or hunting anachronisms, Wilds' site hints that time travel may be all in your head.
Posted by: Nicole Saidi -- CNN iReport Senior Associate ProducerFiled under: Astronomy Space television universe
Every year at about this time, downtown Atlanta, Georgia, is filled to the brim with young, colorfully costumed robot enthusiasts in town for the FIRST competition. These kids are on the cusp of a robotics revolution, because the machines are truly hip right now; they can be found adorning store shelves, song lyrics and snarky T-shirts.
As long as humans have walked the earth, it seems they have dreamed of creating automated machines that can get work done - often, work they hate doing or find repetitive or dangerous - while silently hoping that the 'bots won't get all passive-agressive about it and start starting something. And what if they take over? We're in the midst of National Robotics Week, so let's delve into popular culture and take a look at this fear and fascination with simmering robot passions.
The desire to make automated machines goes back as far as human history itself. Historians and mythologists will point to symbolic robots like Talos, a bronze man incorporated into Greek mythology who was built to protect Zeus' love Europa in Crete. He was both stronger than a man and also able to take torture that people would find intolerable.
Much later on, Leonardo da Vinci was experimenting with an automated humanoid robot that looked like it was a knight's armor. There's a long history of robotic aspirations throughout the years, but the point is, humans want to make machines that kind of look like them and can do things. And when these robots dip into the uncanny valley, where they sort of look human and sort of not, that's when they get a little creepy. It was roboticist Masahiro Mori, in fact, who coined the term in a 1970 writing. And thus, humans grapple with the idea of a robot that is almost human in contrast to a robot that is cute and charming (a la R2-D2 from Star Wars, Johnny 5 from Short Circuit and Wall-E).
Many robots nowadays are designed to be cute for this very reason. CNN iReporter Fatina Chau sent us a photo of an adorable and hardworking robot being tested in Shanghai, China, while another iReporter, Veera K., showed us a robot that dances to cute music while serving food in a restaurant in Bangkok, Thailand. Visitors order their food on a computer panel. These robots aren't threatening, and yet the latter robot could threaten to replace waiters. It's no wonder humanoids are ambivalent about their creations.
Popular culture portrays robots as scary when needed. On TV, Craig Ferguson (or Craigy Ferg, as he's known on the Twitters) lampooned his show's budgetary constraints by creating an ongoing comedy segment featuring a robot skeleton sidekick. This robot is a bit scary-looking, but it's learning. This of course puts the contrast with a human sidekick in stark relief.
We love and hate our robots, and that's why we're always doing the robot dance and singing along to that song "Mr. Roboto" from Styx's 1983 album "Kilroy was here." The song prominently features robots, including the oft-repeated phrase "Domo Arigato, Mr. Roboto." If you're following the plot, Kilroy escapes from prison by pretending to be a robot prison guard. Also, one of the albums on frequent rotation in my playlist is 2002's "Yoshimi Battles the Pink Robots" by The Flaming Lips, which very specifically delineates a fight against pink robots. Although the songs themselves aren't necessarily following the same kind of "Kilroy" story, the robot-esque battle depicted on the cover is attention-getting.
We love our robots but secretly fear and loathe them. So, take a moment right now - yes, right now - to stop everything and do a little robot dance, and then tell us: What do you think?
Posted by: Nicole Saidi -- CNN iReport Senior Associate ProducerFiled under: Geek Out! iReport technology
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