information:extraction, stylistic:style_transfer, structural:expansion
Asteroid impact avoidance

Following the 1994 Shoemaker-Levy 9 comet impacts with Jupiter, Teller proposed to a collective of U.S. and Russian ex- Cold War weapons designers in a 1995 planetary defense workshop at Lawrence Livermore National Laboratory, that they collaborate to design a 1 gigaton nuclear explosive device, which would be equivalent to the kinetic energy of a 1 km diameter asteroid. In order to safeguard the earth, the theoretical 1 Gt device would weigh about 25–30 tons—light enough to be lifted on the Russian Energia rocket—and could be used to instantaneously vaporize a 1 km asteroid, or divert the paths of extinction event class asteroids (greater than 10 km in diameter) with a few months' notice; with 1-year notice, at an interception location no closer than Jupiter, it would also be capable of dealing with the even rarer short period comets which can come out of the Kuiper belt and transit past Earth orbit within 2 years. For comets of this class, with a maximum estimated 100 km diameter, Charon served as the hypothetical threat.