A new theory suggests that the unification between quantum physics and general relativity has eluded scientists for 100 years because huge "fluctuations" in space and time mean that gravity won't play ...

Something is seriously wrong with gravity, and nobody's quite sure why. The problem is that gravity is too weak. Out of the four fundamental physical forces in the universe—gravity, electromagnetism, ...

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.

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A new theory of gravity might explain the curious motions of stars in galaxies. Emergent gravity, as the new theory is called, predicts the exact same deviation of motions that is usually explained by ...

Forbes contributors publish independent expert analyses and insights. The Universe is out there, waiting for you to discover it. When you look out at the Universe, there are a few things you'd ...

The outer regions of galaxies, like our own Milky Way, rotate much faster around the centre than can be accounted for by the quantity of ordinary matter like stars, planets and interstellar gasses.

Physicists have long assumed that the universe is pretty much the same in any direction, and now they've found a new way to test that hypothesis: by examining the shadow of a black hole. If that ...

One of the greatest unsolved puzzles in all of science is dark energy. The Universe isn't just expanding, but the expansion rate that we infer for distant galaxies is accelerating: their recession ...

Ghostly particles could be haunting our universe. A new theory claims that the cosmos is full of unseen particle families that don’t interact with each other. If true, the model could explain why ...

TWEAKING gravity cannot explain why NASA’s twin Pioneer spaceships are drifting off course as they fly across the solar system. Launched in the early 1970s, the Pioneer 10 and 11 probes are ...