Time travel has shifted from pure fantasy to a serious, if highly constrained, topic in modern physics. The equations that ...

Spacetime itself would also need to be “quantized,” or broken down into constituent parts. This is what the notorious string theory attempts to do, as does loop quantum gravity, currently considered a ...

Warp drive has long been shorthand for “pure fantasy,” a narrative device that lets starships hop between stars without ...

Scientist proposes framework for reconciling mathematically incompatible theories of quantum mechanics and Einstein’s gravity At the heart of modern physics is a gulf that scientists have spent more ...

For over a century, scientists have been intrigued to decode the perplexing scenery behind contemporary physics. It's been up for many years, and yet the experts still have no idea how to bridge the ...

Traditionally, we think of the universe as being made up of three spatial dimensions, and a fourth dimension representing time. But mathematician Ben Tippett at the University of British Columbia, ...

Photons emitted by extragalactic sources provide an opportunity to test quantum gravity effects that modify the speed of light in vacuum. Studying the arrival times of these cosmic messengers further ...

What if the universe had no beginning, and time stretched back infinitely without a big bang to start things off? That's one possible consequence of an idea called "rainbow gravity," so-named because ...

Just as white light is made up of various wavelengths of light, so too is spacetime composed of various versions of spacetime. Michelle Starr is CNET's science editor, and she hopes to get you as ...

Physics is built out of philosophically fascinating ideas. Or, at least, ideas that fascinate us as physicists. We are often moved to reverentially proclaim the beauty of various concepts and theories ...