YR4 is a recently discovered near-Earth object (NEO) currently being closely monitored by NASA’s planetary defense teams.
Did you ever go out with friends as a child and roam around the neighborhood, pretending to look for space rocks? Any time you found something that looked "out of the ordinary", you would come up with ...
Could an asteroid hit Earth in 2032? NASA says there's a chance, but the odds keep changing. We asked two experts to break it ...