NANOGrav / Olena ShmahaloIllustration of binary supermassive black holes creating gravitational waves.At the dawn of time, so the theory goes, the cosmos underwent a flash of rapid expansion. Almost instantly the visible Universe grew from a volume smaller than a proton to a spherical region nearly two meters across. It’s a moment known as early cosmic inflation. Although Inflation solves several cosmic problems, such as the homogeneity of the Universe and the ratio of hydrogen to helium we...
