An international team of scientists working with the Event Horizon Telescope project have been able to measure the radius of a black hole for the first time. It was in 1781 that astronomer Charles ...

More than 2,000 years ago, pretty much every educated human knew the Earth was round. There are some pretty obvious clues, after all. If you travel south, you see stars and constellations you’ve never ...

Researchers have made a precise measurement of the size of the proton -- a crucial step towards solving a mystery that has preoccupied scientists around the world for the past decade. The world's ...

It took an array of four radio dishes positioned around the globe and an international team of astronomers to do it, but it was well worth the effort: Astronomers have measured the radius of a ...