Case File: Comet-Earth Collision
History: The investigation into the possibility that one of the hundreds of comets, asteroids, and meteors that are streaking across the solar system may collide into Earth, destroying the entire planet.
Background: One of the largest known collisions of an asteroid and Earth occurred at the Chicxulub impact crater on the Yucatan Peninsuala in Mexico approximately sixty-five million years ago. The event is believed to have caused a mass extinction which killed the dinosaurs.
The Tunguska Event occurred in 1908 in Russia and was believed to have been caused by an asteroid colliding with Earth or disinegrating and exploding in Earth's atmosphere.
Investigations: Several scientists have investigated the possibility of one of the objects in space colliding with Earth and have created a rating system for objects that have a chance of colliding with Earth.
Extra Notes: The case was featured as a part of the February 14, 1997 episode.