A century after their discovery, cosmic rays—particles of extreme energy originating from the far reaches of the ...

Researchers are perplexed by a galaxy that seems too large and too dusty for its place in cosmic history, less than a ...

Astronauts report feeling profoundly awestruck when they go to space, an anthropologist reports. This experience shapes their ...

The concept of spacetime, first described in Einstein's theory of general relativity, has since been widely studied by many ...