NORFOLK, Va. — A light year is exactly what it sounds like: the distance light travels in one year. If you need to get somewhere quick, you'd want to jump on this train because light travels through ...

For more than a century the speed of light was treated as an unbreakable cosmic limit. Now physicists are revisiting that ...

Every generation grows up with starships that jump across galaxies in a heartbeat, but the real universe is far less forgiving than the screen. The same physics that lets GPS satellites work and ...

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 ...

Cosmic speed limits can be a major inconvenience but they've rarely stopped science fiction in its tracks. When you purchase through links on our site, we may earn an affiliate commission. Here’s how ...