Comet Shoemaker-Levy 9 hit the planet

The correct answer is Jupiter. In July 1994, fragments of the comet Shoemaker-Levy 9 collided with Jupiter. This event was significant because it provided the first direct observation of a collision between two solar system objects. The impact created huge, dark scars in Jupiter's atmosphere that were visible for many months. This occurrence helped scientists study the composition of Jupiter's atmosphere and the role of the planet as a cosmic vacuum cleaner that attracts debris due to its massive gravity.