PLANETARY PROTECTION: Astronomers Have Mapped The Paths of Hazardous Asteroids For The Next 1,000 Years. “The astronomers identified one particular NEO, Asteroid 7482, as especially hazardous. This asteroid will spend a significant amount of time near the Earth for the next millennium. While that doesn’t necessarily mean that it will strike our planet, it does mean that this rock poses the greatest chance of a collision within the next thousand years.”