Spiral galaxies rotate at such a high speed that the gravity calculated only from their visible stars could not prevent them from dispersing. To solve this puzzle, physicists have postulated ...

Dark matter is currently the most widely accepted hypothesis for explaining some of the weirdness we see in the cosmos – but it’s not the only possibility. Now, a team of astronomers has discovered ...

Our solar system officially houses eight planets, but some scientists say there could be a ninth. And that’s not just Pluto aficionados – evidence suggests a huge undiscovered world lurks on the dark ...

(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 ...

Case Western Reserve astronomer Stacy McGaugh and international collaborators detect ‘external field effect,’ a prediction unique to rival dark matter hypothesis An international group of scientists, ...

Although dark matter is a central part of the standard cosmological model, it’s not without its issues. There continue to be nagging mysteries about the stuff, not the least of which is the fact that ...

For a few centuries, physicists were comfortable with our laws of gravity. Then, something interesting happened in the 1900s, as astronomers measured the rotational speed of galaxies. Something was ...

Gravity used to be the most dependable rule in the cosmic rulebook, the quiet background force that never changed its mind.