A meteor strike in central Russia on Friday that left hundreds of people injured is the biggest known human toll from a space rock, a British expert said. But the impact has no connection with a flyby by an asteroid later Friday, according to Robert Massey, deputy executive secretary of…
Astronomers on Friday said they had observed the largest structure yet seen in the cosmos, a cluster of galaxies from the early Universe that spans an astonishing four billion light years. The sprawling structure is known as a large quasar group (LQG), in which quasars — the nuclei of ancient…