Cosmic microwave background data support cosmology’s standard model but retain a mystery about the universe’s expansion rate.

New images of the infant universe captured by the Atacama Cosmology Telescope (ACT) are the most precise "baby pictures" to ...

The most powerful cosmic rays raining down on Earth may come not from distant corners of the universe but from heavy dark ...

Over five years, the highly sensitive telescope was used to observe the "cosmic microwave background ... clouds of gases that form planets and galaxies. The universe was too hot during its ...