Measuring the time discrepancy between Earth and Mars will help make future navigation and communication systems on the Red ...

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 ...

Optical lattice clocks are devices that measure the passing of time via the frequency of light that is absorbed or emitted by ...

Standing in the elevator of a towering skyscraper, you might wonder if your journey upward changes more than just your view.