Comet Shoemaker-Levy 9 at Jupiter

From the 16th to the 22nd of July, 1994, the world was privileged to witness an event that probably recurs less often than once a century. Collision of the brightest nuclei of Periodic Comet Shoemaker-Levy 9 produced enormous dark clouds that were the most dramatic and easily observed features on Jupiter recorded by human visual observation. They were seen by tens of thousands of people through hundreds or thousands of telescopes ranging in aperture from 5 to more than 100 cm. Tens of millions of people participated vicariously in the impact event through viewing on television the magnificent images from the Hubble Space Telescope (HST) and from numerous ground-based telescopes.