Twenty-five years ago, humanity first witnessed a collision between a comet and a planet. From July 16 to 22, 1994, enormous pieces of the comet Shoemaker-Levy 9 (SL9), discovered just a year prior, crashed into Jupiter over several days, creating huge, dark scars in the planet’s atmosphere and lofting superheated plumes into its stratosphere.
Source:
https://phys.org/news/2019-07-historic-jupiter-comet-impact-planetary.html