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

Last Word is New Scientist’s long-running series in which readers give scientific answers to each other’s questions, ranging ...

Physicists have demonstrated with unprecedented accuracy that the speed of light remains constant. In 1887, a landmark physics experiment was carried out by American researchers Michelson and Morley.

An experiment has visualized a prediction about objects traveling at the speed of light known as the Terrell-Penrose effect, ...

It takes light a single day to travel 16 billion miles. The Voyager 1 probe will need a little longer, just 49 years.

This means that it would still take a little over four whole years of traveling at lightspeed to reach the red dwarf—not that ...

In a cafe at CERN in 1992, three physicists realized they disagreed about how many constants are needed to describe all of nature. A recent paper suggests only one – time – is necessary.

Based on these initial findings, the team further developed extremely high-resolution simulations called "shock-tubes." ...

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

We live on a planet that seems motionless, yet Earth orbits the Sun at a dizzying speed, and our entire Solar System moves ...

Since then, countless experiments have confirmed that light always travels at the same speed in a vacuum — about 300,000 ...

The Blueair Blue Signature is a near-perfect air purifier: quiet, beautifully designed and effective at removing odors and ...