What Does Time Travel Look Like?

The answer depends, of course, on your perspective, NASA astrophysicist Alex Antunes writes at ScientificBlogging. It's different for a Hollywood director vs. a physicist, for example.

In a story and a pair of videos starring other smart scientists [below], we've explore whether time travel is possible and what the known physical limitations are.

Antunes, meanwhile, digs right into some cool possibilities: "If time travel involves a direct, instantaneous shortcut from 'now' to 'then,' then time travel is exceedingly abrupt. First you're here, then you're there," he writes. "If time travel uses a door, portal, or wormhole, then you see whatever the door, portal, or wormhole passes through."

Read more from Antunes, or for sheer whimsy, vote for your Favorite Time Travel Tale.