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The grandfather paradox is just one of the thorny logical problems that arise with the concept of time travel. But one physicist says he has resolved them.

Scientists used the most massive fundamental particles to break special relativity, but even that didn’t work.

Emmy Noether showed that fundamental physical laws are just a consequence of simple symmetries. A century later, her insights ...

Like stretch marks left on skin that expanded too quickly or cracks embedded in freezing ice, cosmic strings are artifacts of what the universe looked like in the moments before it rapidly changed ...

On 25 November 1915, Albert Einstein presented his general theory of relativity at the Prussian Academy of Sciences. This theory is still considered to be the most important idea in modern physics.

Vanderbilt University physicist Lorenzo Gavassino isn't so sure this is as big an obstacle as time-traveler pessimists have ...

In the first study of its kind at the Large Hadron Collider (LHC), the CMS collaboration has tested whether top quarks adhere ...

Researchers at the Large Hadron Collider tested whether top quarks, the most massive known elementary particles, comply with ...

At the heart of this theory is Einstein’s general relativity, which reshaped our understanding of space and time. Unlike the linear progression of events described by Newtonian physics ...

This NASA/ESA Hubble Space Telescope image reveals a tiny patch of sky in the constellation Hydra. The stars and galaxies depicted here span a mind-bending range of distances. The objects in this ...