NASA Discovers Secret Moon Orbiting Nearby ‘Planet Killer’ Asteroid After Recent Close Closeness to Earth
Fuzzy new photos of a mountain-sized asteroid, a ‘planet killer’ that recently reached its closest approach to Earth in more than a century have revealed a surprising new feature of the giant space rock: it has a secret mini-moon. Asteroid 2011 UL21 is a possibly dangerousnear-Earth object previously estimated to be anywhere from 1.1 to … Read more