Philadelphia can’t set the speed limits on roads within its own borders. Only the state can. So city transportation officials ...

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.

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

New measurements of radio galaxies reveal that the solar system is racing through the universe at over three times the speed ...

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.

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." ...

President Trump’s remarks after an assault on National Guard members underscore his intention to reshape the immigration ...

Team behind Purdue’s single-photon switch. Click for info. There are few technologies more fundamental to modern life than ...

Amazon’s Black Friday sale is live, and we’ve sifted through the bogus discounts to surface truly great deals on Wirecutter ...