Time really does move faster on Mars, but the breakthrough that confirms it did not come from a spacecraft’s stopwatch.

Physics sets unforgiving limits on how fast anything can move, yet the same laws also leave surprising room for creative ways to cross the gulf between stars. The real question is not whether the ...

Director Christopher Nolan (the “Dark Knight” trilogy) must have read Einstein’s Theory of Relativity, as well as binge-watching Morgan Freeman’s “Through the Wormhole” TV documentary, before sitting ...