Einstein’s Theory of General Relativity is currently our best approximation of how the universe ticks. But there are holes.

The universe’s accelerating expansion has long puzzled physicists. For decades, dark energy, an unseen force thought to make ...

The answer comes from a counterintuitive result of special relativity, a field of physics which is notoriously difficult to ...

Why the universe is expanding faster and faster remains one of the biggest open questions in physics. Current theories cannot ...

The accelerating expansion of the universe is usually explained by an invisible force known as dark energy. But a new study ...

Einstein’s claim that the speed of light is constant has survived more than a century of scrutiny—but scientists are still ...