A near-Earth object is not a large orbiting body.
 Comet nuclei are typically less dense than asteroids but they pass Earth at higher relative speeds, thus the impact energy of a comet nucleus is slightly larger than that of a similar-sized asteroid
 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

