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

The standard explanation has been dark energy, an invisible force added into the equations to make the math work. But now, an ...

A variation on the theory of quantum gravity — the unification of quantum mechanics and Einstein's general relativity — could help solve one of the biggest puzzles in cosmology, new research suggests.

Einstein's theory of general relativity views time similarly to width, height, and length. As such, both time and space can be curved by gravity. This effectively means that time is slower the closer ...