Earth Extinction Sized Comets
by Brian Wang from NextBigFuture.com on (#6FQ98)
NASA has a catalog of many large comets and some of them are nearly as large or larger than the Chicxulub impactor (Dinosaur killer). Comet 109P/Swift-Tuttle takes 133 years to orbit the Sun once. Swift-Tuttle last reached perihelion (closest approach to the Sun) in 1992 and will return again in 2125. Swift-Tuttle is a large ...