Comet Shoemaker–Levy 9
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Comet Shoemaker–Levy 9 broke apart in July 1992 and collided with Jupiter in July 1994, providing the first direct observation of an extraterrestrial collision of Solar System objects. This generated a large amount of coverage in the popular... Wikipedia
Discoverers: Eugene Merle Shoemaker, David H. Levy, and Carolyn S. Shoemaker
Dimensions: 1.8 km (1.1 mi)
Radius: 0.62137 mi
Discovered: March 24, 1993
Density: 500 kg/m³
Discovery site: Palomar Observatory