Today’s Google Doodle celebrates Olaus Roemer, also known as ‪‪Ole Rømer‬‬, the Danish astronomer and scientist who was the first to successfully determine the speed of light. Read more: How to ...

The universe has a speed limit, and it's the speed of light. Nothing can travel faster than light — not even our best spacecraft — according to the laws of physics. So, what is the speed of light?

In 1676, by studying the motion of Jupiter's moon Io, Danish astronomer Ole Rømer calculated that light travels at a finite speed. Two years later, building on data gathered by Rømer, Dutch ...