The accelerating expansion of the universe is usually explained by an invisible force known as dark energy. But a new study ...

BOULDER- Black holes, time travel and E= mc^2. They are all related to Albert Einstein's Theory of Relativity. How many of us, though, can actually explain any of it? This year, Einstein's theory ...

The most surprising element is that a MOND-influenced theory of gravity—also co-authored by Milgrom—explains this unexpected ...

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A bizarre "cosmic glitch" in the theory of how the gravity of the universe works may have been mended. The strange glitch in Einstein's description of gravity in his theory of general relativity may ...

Why the universe is expanding faster and faster remains one of the biggest open questions in physics. Current theories cannot ...

For over a century, Einstein's general theory of relativity has been key to understanding gravity. But new research suggests this theory "glitches" in the farthest reaches of space. That doesn't mean ...

Quantum theory and Einstein's theory of general relativity are two of the greatest successes in modern physics. Each works ...

The answer comes from a counterintuitive result of special relativity, a field of physics which is notoriously difficult to ...