Word: astronautical
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...spirit of full disclosure, first a little history. In Rome, I shed tears of happiness at a gelateria. I spooned icing straight out of the Betty Crocker tub at the house where I baby-sat in high school. I frequented the New York Hall of Science in pursuit of astronaut ice cream. Even my past four years in Cambridge have served up some very sweet memories...
Each conference also features "a nationally known keynote speaker," according to Counter. Past speakers have included Jaime Escalante, the calculus teacher whose story served as the basis for the movie Stand and Deliver and Mae Jemsion, the first black female astronaut...
...from now? Just travel to a star 500 light-years away and return, going both ways at 99.995% the speed of light. When you return, the earth will be 1,000 years older, but you'll have aged only 10 years. I already know a time traveler. My friend, astronaut Story Musgrave, who helped repair the Hubble Space Telescope, spent 53.4 days in orbit. He is thus more than a millisecond younger than he would have been if he had stayed home. The effect is small, because he traveled very slowly relative to the speed of light...
With more money, we could do better in the next century--but only a little. If we sent an astronaut to the planet Mercury and she lived there for 30 years before returning, she would be about 22 seconds younger than if she had stayed on Earth. Clocks on Mercury tick more slowly than those on Earth because Mercury circles the sun at a faster speed (and also because Mercury is deeper in the sun's gravitational field; gravity affects clocks much as velocity does). Astronauts traveling away from Earth to a distance of 0.1 light years and returning...
...suggested that you could use such a wormhole to travel into the past. Here's how you do it: move one mouth of the wormhole through space at nearly the speed of light while leaving the other one fixed. Then jump in through the moving end. Like a moving astronaut, this end ages less, so it connects back to an earlier time on the fixed end. When you pop out through the fixed end an instant later, you'll find that you've emerged in your own past...