Humanity has achieved remarkable feats, yet 95% of the universe remains invisible and unexplained. Our theories, general ...

Kellogg Stelle was a professor of physics at Imperial College London for decades until his death last month. In 1977, he developed a particle theory of gravity that’s renormalizable, but the theory’s ...

Einstein’s theory of relativity reveals that time is not fixed — it bends, stretches, and slows depending on speed and ...

At the turn of the century, it sounded as if string theory could give us big answers about the universe. Well… has it?

We live in the present, moving through time. As events come and go, everything fades into the past. But what is time, really?

Black holes, regions of spacetime in which gravity is so strong that nothing can escape, are intriguing and extensively ...

Relativity Space, a launch startup developing a reusable rocket, has expanded a contract to provide launches for satellite ...

In 1980, Stephen Hawking gave his first lecture as Lucasian Professor at the University of Cambridge. The lecture was called ...

Learn more about the images advanced telescopes could take of black holes and how they could back up Einstein’s general ...

In 1980, Stephen Hawking gave his first lecture as Lucasian Professor at the University of Cambridge. The lecture was called "Is the end in sight for ...

String theory unifies all the forces of nature. Forces that seem very different, such as gravity and electricity, are deeply ...

The search for quantum gravity is the next big step in physics, as researchers seek to unify the physics of the very small ...