A near-Earth object is abbreviated as NGO.
 In April 2017, the IAU adopted a revised definition that generally limits meteoroids to a size between 30 m and 1 m in diameter, but permits the use of the term for any object of any size that caused a meteor, thus leaving the distinction between asteroid and meteoroid blurred
 All co-orbital asteroids have special orbits that are relatively stable and, paradoxically, can prevent them from getting close to Earth:Trojans: Near the orbit of a planet, there are five gravitational equilibrium points, the Lagrangian points, in which an asteroid would orbit the Sun in fixed formation with the planet

