By comparing different models of the shock, the authors derive a “mach number” M≈2.4, which says the clusters are colliding at 2.4 times the speed of sound. That’s quite a sonic boom, particularly given that the speed of sound in the hot plasma is around 2 million miles per hour!
Theres trouble brewing in the field of cosmology, as astrophysicists attempt to understand the latest measurements of the Hubble constant.
The observed spectra of astrophysical neutrinos and gamma rays do not match up using current models. Today’s paper may have solved this quandary.
Simulations of the first groups of stars display a variety of shapes and sizes, and may provide clues as to where their ancestors are hiding today
Early in its history, cloudy weather could have helped Mars retain enough heat for liquid water to exist on its surface.
Major mergers (collisions between two galaxies of similar size) are some of the most dramatic cosmic events. But in the grand scheme of things, how important are they, really?