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By proving a single photon can't travel faster than light, scientists say they have proven time travel is impossible. THE GIST Hong Kong physicists say they have proven a single photon cannot travel faster than the speed of light. This demonstrates that time travel is impossible, they say. Hong Kong physicists say they have proved that a single photon obeys Einstein's theory that nothing can travel faster than the speed of light — demonstrating that outside science fiction, time travel is impossible. The Hong Kong University of Science and Technology research team led by Du Shengwang said they had...

Time travelers, if they exist amongst us, have yet to betray their period-hopping ways online, according to a fun, new study aimed at finding visitors from another time, based on their digital footprints. Theoretically, the idea of time travel forward in time should be possible according to Einstein's General Theory of Relativity. In fact, scientists have already sent teensy particles called muons forward in time. But sending a large object, such as an entire person, into the future remains in the echelons of science fiction, for now. Even so, over a summer poker game, Robert Nemiroff, an astrophysicist at Michigan...