For nearly a century, astronomers have watched galaxies spin and the universe expand in ways that visible matter alone cannot ...

The mystery of dark matter—unseen, pervasive, and essential in standard cosmology—has loomed over physics for decades. In new ...

One of the biggest cosmological mysteries centers on a discrepancy in how fast the universe is expanding. A new study comes to an intriguing solution by applying a modified theory of gravity and an ...

(via Sabine Hossenfelder) Most astrophysics are pretty convinced that 80% of the matter in the universe is some invisible stuff that they can’t detect - dark matter. The idea has become more popular ...

An international group of scientists, including Case Western Reserve University Astronomy Chair Stacy McGaugh, has published research contending that a rival idea to the popular dark matter hypothesis ...

How did the first galaxies after the Big Bang form and evolve? Were they small and attributed to dark matter or were they large and some other force attributed to their growth? This is what a recent ...

This figure shows the range of the sky-projected separation s corresponding to the Newton–MOND transition range in acceleration The inset shows the Keplerian prediction on the range of orbital periods ...

A theory developed to replace dark matter may mean bad news for Planet Nine, a hypothetical as-yet-unseen world in the outer solar system. The odd orbital alignments of icy objects in this region that ...

Wide binary stars with separation greater than about 2000 astronomical units are interesting natural laboratories that allow a direct probe of gravity at low acceleration weaker than about 1 nanometer ...

Quantum gravity and field theory represent a frontier where the principles of quantum mechanics are reconciled with Einstein’s description of gravity. Researchers are seeking a consistent framework ...

An international group of scientists, including Case Western Reserve University Astronomy Chair Stacy McGaugh, has published research contending that a rival idea to the popular dark matter hypothesis ...