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

Given the fact that satellites orbit amongst one another at thousands of miles per hour, it's vitally important to know exactly how fast they're going, in order to avoid collisions. A new device ...

Something struck NASA’s Stardust spacecraft at a speed that defied all expectations—an object moving at nearly 13,650 miles ...

Stanford researchers have become the first to demonstrate that machine-learning control can safely guide a robot aboard the ...

The idea was first hypothesized about 70 years ago. In a bizarre repercussion of Albert Einstein's Special Theory of Relativity, objects traveling close to the speed of light appear flipped over. The ...

So, you’re driving a car at half the speed of light. (Both hands on the wheel, please.) You turn on the headlights. How fast would you see this light traveling? What about a person standing by the ...

The speed of light has been one of science’s most trusted markers of stability. For more than a century, the idea that light ...

Physicists tested light speed using cosmic gamma-ray bursts. Study confirms Einstein's prediction that all light colors travel at same speed.