The other method examines the cosmic microwave background, the leftover radiation from the big bang, to study the initial conditions of the universe and estimate how quickly it has expanded since ...

The polarization of light from the cosmic microwave background is key to understanding the young Universe. Sigurd Naess points out that ACT has five times higher resolution than Planck.

Host Regina Barber talks with two cosmologists about the cosmic microwave background, its implications for the universe's origins and the discovery that started it all. Interested in more space ...