Imagine a swarm of fireflies, flickering lights on and off in the nighttime space. How does the human brain process and ...

A test using atomic clocks will watch superpositions ride Earth’s curved space-time and see if Einstein can play nice with ...

What is time? It’s something we all experience, yet it remains one of the most puzzling concepts in physics. Time is often ...

Quantum networking is being rapidly developed world-wide. It is a key quantum technology that will enable a global quantum ...

You cannot treat space and time separately, as they are inextricably linked; moving through one affects your motion through the other, regardless of any other properties inherent to your spacetime.

This column on general relativity and space-time by physicist Sean Carroll was published on Nov. 23, two days before the 100th anniversary of Einstein’s theory of general relativity.

Spacetime is four-dimensional. We can move through the three dimensions of space at will, passing up and down, side to side, or forward and backward. But we are also always moving through a fourth ...

Time travel appears to contradict logic. (Image credit: Shutterstock) The other main issue is less practical, but more significant: it is the observation that time travel seems to contradict logic ...