General relativity is an astonishingly beautiful theory, and grappling with why it disagrees with quantum mechanics is a joy, ...

Could a reactionless, gravity-defying propulsion system actually work? A former NASA engineer says yes, but scientists are ...

This new propulsion system could rewrite the rules of spaceflight—not to mention completely defy conventional physics.

"The singularity is the most mysterious and problematic part of a black hole. It's where our concepts of space and time ...

A new analysis of astronomical data suggests unknown physics is at work assisting dark energy in acting almost as ...

Could neutrinos finally reveal everything we're searching for about quantum gravity? These ghostly particles, capable of ...

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