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Hundreds hurt in rare Russian meteor strike

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 spot biggest structure in the universe

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…