Light is an extremely useful tool for quantum communication, but it has one major disadvantage: It usually travels at the speed of light and cannot be kept in place. A team of scientists at the Vienna ...

Einstein’s claim that the speed of light is constant has survived more than a century of scrutiny—but scientists are still daring to test it. Some theories of quantum gravity suggest light might ...

In other words, the matter traveled at 20% the speed of light. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Supermassive black holes are ...

The idea was first hypothesized about 70 years ago. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. In a bizarre repercussion of Albert ...