When you look out at the Universe, there are a few things you'd rationally expect. You'd expect that the same things that made up everything we saw — like atoms and light — made up everything there ...

Despite numerous searches, we have yet to detect dark matter particles. So some astronomers favor an alternative, such as modified Newtonian dynamics (MoND) or modified gravity model. And a new study ...

Neutron stars are laboratories for extreme gravity, dense matter and strong magnetic fields. Modified theories of gravity extend Einstein’s general relativity by introducing new functions of spacetime ...

(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 ...

A new study reports conclusive evidence for the breakdown of standard gravity in the low acceleration limit from a verifiable analysis of the orbital motions of long-period, widely separated, binary ...

When it comes to cosmology, the macro scale is important. As scientists search for the reasons behind the increasing rate at which the universe is expanding, they modify Einstein’s theory of gravity ...

Modified gravity theories extend or alter Einstein’s general relativity to address observational puzzles such as the accelerated cosmic expansion, the nature of dark matter and dark energy, and ...