1. Comet Shoemaker-Levy 9 was a famous comet that gained attention due to its impending collision with a planet.
2. The comet had been captured and broken apart by the strong gravity of the planet Jupiter.
3. In July 1994, the fragments of Comet Shoemaker-Levy 9 collided sequentially with Jupiter, creating spectacular impact marks in the planet's atmosphere that were observed by astronomers worldwide.
4. The event provided valuable data about cometary impacts and Jupiter's atmosphere.