The most detailed snapshots so far of the infant universe are confirming that the cosmos consists mostly of mystery material, called dark energy, that accelerates the universe’s expansion. The new ...

With CMB-S4, scientists hope to connect a sandy desert with a polar desert—and revolutionize our understanding of the early universe. In the 1960s, an anomalous, faint electromagnetic glow was ...

In the leading model of cosmology, most of the universe is invisible: a combined 95% is made of dark matter and dark energy.

These gigantic structures, which contain hundreds or even thousands of galaxies bound together by gravity, offer important ...

"Maybe the cosmologists can relax a bit now." When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. A new analysis of how galaxy clusters evolved over ...