Few ideas in modern science have reshaped our understanding of reality more profoundly than space-time—the interwoven fabric of space and time at the heart of Albert Einstein's theory of relativity.

Scientists say fragments of energy may be the fundamental building blocks of the universe—not particles and waves.

Textbooks give strange, imprecise explanations of where things happen in quantum mechanics. Consistency with gravity needs a fresh approach.

Many theories are rock-solid: Scientists have just as much confidence in the theories of relativity, quantum mechanics, ...

Curious connections between physics and math suggest to Latham Boyle that space-time may survive the jump to the next theory of reality.

A radical new theory regarding the origin of the universe suggests that gravitational waves, tiny ripples in spacetime first ...

Physics The radical idea that space-time remembers could upend cosmology There are new hints that the fabric of space-time may be made of "memory cells" that record the whole history of the universe.

A quantum network of distant clocks The entangled clocks can test how quantum theory behaves in the presence of curved space-time as predicted by Einstein, or whether our current theories break down.

A team of scientists claims a computational tool for studying black hole collisions could be our best bet for answering ...

According to Newtonian physics, the gravitational attraction between two masses is proportional to the inverse of the square ...

A new physics paper takes a step toward creating a long-sought "theory of everything" by uniting gravity with the quantum world. However, the new theory remains far from being proven observationally.