You never know when it’s going to happen. A flying saucer pulled off the side of the highway with the hood up, alien waving a tentacle wielding what could be a sparkplug, a cellphone or a ray gun and shouting, “Znelflgjpd knorb zlothkpmzus!” How would you respond? You’ve hit the alien language barrier. With NASA’s Kepler telescope spotting potentially habitable planets by the dozen outside our solar system, it may be time for us to start brushing up on our extraterrestrial language skills, or get ready to tutor E.T. in Earthish as a Second Language.