Comet Shoemaker-Levy 9 was discovered in a photograph taken on the night of March 24, 1993 with the Schmidt telescope at the Mount Palomar Observatory in California, and was the ninth comet discovered by astronomers Carolyn and Eugene M. Shoemaker and David Levy. It turned out to be the first comet observed orbiting a planet (Jupiter, in this case) and not the Sun. The comet was also unusual because it was in fragments, due to a close encounter with Jupiter in July 1992 when it approached closer to the planet than its Roche limit and was pulled apart by tidal forces. Between July 16 and July 22 1994, the fragments of the comet collided with Jupiter's southern hemisphere at 60 kilometres per second (37 miles per second), providing the first direct observation of the collision of two solar system objects. The collision resulted in disruptions in Jupiter's atmosphere, such as plumes and bubbles of gas, and dark spots in the atmosphere which remained visible for several months. The event was closely observed and recorded by astronomers worldwide as a result of its tremendous scientific importance, and also generated a large amount of coverage in the popular media.

Read the rest of this article: http://en.wikipedia.org/wiki/Comet_Shoemaker-Levy_9

_______________________________ Today's selected anniversaries:

655: Penda of Mercia was defeated by Oswiu of Northumbria at the Battle of Winwaed. (http://en.wikipedia.org/wiki/Penda_of_Mercia)

1864: William Tecumseh Sherman (pictured) began his "March to the Sea". (http://en.wikipedia.org/wiki/Sherman%27s_March_to_the_Sea)

1920: The first general assembly of the League of Nations was held in Geneva, Switzerland. (http://en.wikipedia.org/wiki/League_of_Nations)

1971: Intel released the 4004, the world's first single-chip microprocessor. (http://en.wikipedia.org/wiki/Intel_4004)

1988: The Soviet Buran shuttle was launched on her first and only space flight. (http://en.wikipedia.org/wiki/Shuttle_Buran)

_____________________ Wikiquote of the day:

Variety's the very spice of life, That gives it all its flavour. -- William Cowper -- (http://en.wikiquote.org/wiki/William_Cowper)