The mind-bending concept of time dilation results from a seemingly harmless assumption—that the speed of light is the same ...

The nodes in a quantum network don’t necessarily have to be computers; they can also be atomic clocks. The cesium atoms that ...

You zip around the solar system at around 186,000 miles per second/299,791 kms (let’s conveniently ignore the time it takes you to accelerate to that speed as well as any time spent slowing down ...

As we increase the speed to relativistic speeds, the momentum will increase even more. This means that we will need a much greater impulse to further increase the speed.

Special relativity also affects many other things physicists measure—for example, the frequency and intensity of light and also the size of an object’s appearance.

Hawking and Milner’s plan was to build thousands of tiny spacecraft the size of microchips and use light to accelerate them to a relativistic speed—one this close to the speed of light.

In a vacuum, the speed of light is about 186,000 miles per second (300,000 kilometers per second). If it were orders of magnitude slower, humans would immediately take notice.

An object traveling at a relativistic speed past you doesn't warp space-time more than its rest mass because that momentum isn't interacting with anything. Again, please ELI5 if I'm wrong.

In the first step, where we accelerate the mass to a high relativistic speed, we also accelerate the cylinder in the opposite direction. Now, in special relativity, we don't conserve energy and ...

However, there is, of course, a price to pay for that solution: a paradigm change as startling as the one that accompanied Einstein's theory of relativity — which told us, despite our intuitions ...