The speed of light is a fundamental constant, approximately 299,792,458 meters per second. It's the same for all observers and hasn't changed measurably over billions of years. Nothing can travel ...

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 ...

Every generation grows up with starships that jump across galaxies in a heartbeat, but the real universe is far less ...

What you see in the night sky is not always reality. There are many illusions up there. Whenever you gaze upon the starry sky you do not see the stars in real-time. You’re actually staring into the ...

The glow from faster-than-light particles gives us a unique way to explore the universe. Nothing can travel faster than light — in a vacuum. But when light slows down, sometimes matter can blaze past ...

In a groundbreaking discovery, physicists have observed light traveling in reverse, an event that significantly challenges our fundamental understanding of physics. This event was noted in certain ...

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 ...

The speed of light is the fastest anything can travel. What happens to a photon from a galaxy 25 million light years away on its journey toward Earth? When you purchase through links on our site, we ...

Faster than light travel may produce gravitational waves that we could see here on Earth. Warp drives may or may not be possible, but if they are then could a distant alien civilization’s warp fields ...

Fast-moving objects don’t always look the way you’d expect. When something travels near the speed of light, strange things happen—not just to time and space, but also to how the object appears. For ...