Some physicists think our reality is a kind of cosmic hologram, with space, time, and gravity as manifestations of a ...

Time travel has long been a topic of science ... or CTCs—paths through space-time that loop back to the same ... A new quantum theory shows that time travel might work—if memory, ...

Time travel has long been a staple of science fiction, captivating imaginations with the possibility of moving through time ...

Time, not space plus time, might be the single fundamental property in which all physical phenomena occur, according to a new ...

One of the biggest questions in physics asks whether space-time is classical or quantum in nature. From slow neutrinos to quantum foam, these experiments are hoping to finally answer it ...

A novel theory of "wavy space-time" suggests the division between our best descriptions of the universe on its smallest and largest scales may be because gravity does not play by quantum rules.

Space is big and time is relative, so a change to a quantum particle on Earth that’s entangled with a particle near a black hole 10 billion light-years away would mean changing the behavior of ...

A concept called “quantum entanglement” suggests the fabric of the universe is more interconnected than we think. And it also suggests we have the wrong idea about reality.

Time is a thorny problem for physicists; its inconsistent behavior between our best theories of the universe contributes to a deadlock preventing researchers from finding a "theory of everything ...

A new quantum theory shows that time travel might work—if memory, aging, and entropy reset inside a closed time loop. (CREDIT: CC BY-SA 4.0) ...

Time travel has long been a topic of science fiction, filled with thrilling possibilities and mind-bending problems. The most famous of these problems is the "grandfather paradox".