Asteroid resulted in the Cretaceous–Paleogene extinction, and the 1994 observation of Comet Shoemaker-Levy 9 crashing into Jupiter. The U.S. military also declassified the information that its military satellites, built to detect nuclear explosions, had detected hundreds of upper-atmosphere impacts by objects ranging from one to ten meters across. All these considerations helped spur the launch of highly efficient surveys that consist of charge-coupled device (CCD) cameras and computers directly connected to telescopes. , it was estimated that 89% to 96% of near-Earth asteroids one kilometer or larger in diameter had been discovered. A list of teams using such systems includes: ,
The Shoemaker and the Elves (film) The Shoemaker and the Elves (film) The Shoemaker and the Elves is a 1935 Color Rhapsodies short directed by Arthur Davis. It concerns a poor shoemaker who gives a little boy shelter from a storm. A homeless waif, staggering through a roaring snow storm, wanders into a small town and no one except a poor shoemaker will give the little boy shelter from the storm. That night, the elves come in with their equipment and material, and make a new supply of shoes for the old man. In the morning, seeing what has happened, the old man tells the boy