NASA is closely monitoring a building-sized asteroid as it makes its closest approach to Earth today, among a group of five ...

But Nasa's Centre for Near Earth Object Studies also updated the chance ... Researchers in Australia put cameras on sea lions' backs to help them map the elusive ocean floor.

Asteroid 2023 BU will make "one of the closest approaches by a known near-Earth object ever recorded" on Thursday, NASA says An asteroid "about the size of a box truck" is expected to come closer ...