Cosmology is big-picture astronomy — the universe on its grandest scales. From the mysteries of dark matter and dark energy to the vast cosmic web, modern cosmology probes what makes the cosmos tick.

Here you’ll find Sky & Telescope’s coverage of the latest discoveries in cosmology. Want to know about evidence for the Big Bang or hints of new physics? What about the expansion of the universe and the effects of dark matter? Interested in knowing what happened a long, long time ago in galaxies far, far away? What can we learn about galaxy formation at the very beginning if we gather enough photons? We bring you in-depth reports on the early universe, ancient galaxies, and the cosmic microwave background, the leftover radiation of the universe’s birth. As scientists peer farther back in time and space, pushing the limits of the knowable, we’ll be your guides on the quest to reach the cosmic dawn.

Bullet Cluster

Does a Fifth Force Permeate the Universe?

A team of theoretical physicists thinks a fifth force could explain an anomaly spotted in a nuclear physics experiment. If true, it could have huge ramifications for particle physics and dark matter — but that’s a pretty big if.