Cosmology

Cosmologists have concluded that the universe doesn’t appear to clump as much as it should. Could both of cosmology’s big puzzles share a single fix?

Detailed computer simulations have found that a cosmic contraction can generate features of the universe that we observe today.

Modified gravity theories have never been able to describe the universe’s first light. A new formulation does.

Astronomers are discovering that magnetic fields permeate much of the cosmos. If these fields date back to the Big Bang, they could solve a major cosmological mystery.

The astrophysicist and social media phenom Katie Mack is ready to tell you about the fate of the universe.

Einstein’s equations describe three canonical configurations of space-time. Now one of these three — important in the study of quantum gravity — has been shown to be inherently unstable.

Physicists have proposed extra cosmic ingredients that could explain the faster-than-expected expansion of space.

In our mind’s eye, the universe seems to go on forever. But using geometry we can explore a variety of three-dimensional shapes that offer alternatives to “ordinary” infinite space.

The recent discovery of some of the first galaxies in the universe illuminates the darkest era in cosmic history.