My telescope, set up for astrophotography in my light-polluted San Diego backyard, was pointed at a galaxy unfathomably far from Earth. My wife, Cristina, walked up just as the first space photo ...

What happens when you travel close to the speed of light? Discover the real physics behind time dilation, where your clock ...

Time is relative. The ticking of the clock, even of the most precise clocks we can make, does not exist in an absolute. It ...