Dark matter and dark energy may be weird and (as of now) inexplicable, but they do seem to exist.
Albert Einstein's theory of special relativity explains how space and time are linked, but it doesn't include acceleration. By including acceleration, Einstein later developed the theory of general relativity, which explains how massive objects in the cosmos distort the fabric of space-time. The theory explains how this distortion is felt as the force of gravity, as it predicts how much the mass of an object curves space-time. Scientists test relativity by observing objects in space and seeing if their behaviors match up with Einstein's explanations of space-time and gravity, for instance by observing how light bends around massive objects as it travels towards Earth.
Einstein's theory of general relativity has passed its most stringent test to date with flying colors, a new study reports.
As good skeptics, we shouldn't immediately believe general relativity's tangle of mathematics at first blush. Instead, we need evidence. Good evidence.
A new study validates Einstein's theory of general relativity in a distant galaxy for the first time.
Albert Einstein's theory of general relativity is a monumental achievement of human ingenuity, creativity and perseverance — to say the least.
Stephen Hawking may have been a world-renowned genius, but he didn't take himself too seriously, according to a tribute published online today (April 12) in the journal Science.
Those inspired by Stephen Hawking's classic book "A Brief History of Time" and by his legacy in cosmology are now picking up where Hawking's genius left off.
There's a lot we still don't know about black holes, but these light-gobbling behemoths would be even more mysterious if Stephen Hawking hadn't plumbed their inky depths.
The gravitational-wave research community seems to be having a remarkable string of good luck. Here's what the smashing finding means.
Three scientists revealed humorous and touching reactions to discovering that they had received the 2017 Nobel Prize in physics.
Einstein would be pleased — but flabbergasted — to hear the details of humanity's first direct detection of gravitational waves, according to one of three new Nobel winners for the discovery.
Albert Einstein's theory of general relativity suggests backward time travel is possible in some scenarios, but do those situations ever exist in our universe?
For some skywatchers, the upcoming total solar eclipse is an opportunity to duplicate one of the most famous experiments of the 20th century.
In the season finale of "Genius," Albert Einstein lives out his twilight years as an American citizen.