
Shoemaker-Levy 9 was a comet captured into orbit around Jupiter that was torn apart by the planet's tidal forces during a close 1992 pass, breaking into a line of about 21 fragments famously dubbed the "string of pearls." Between July 16 and 22, 1994, those fragments slammed into Jupiter's southern hemisphere at roughly 60 km/s, leaving dark impact scars larger than Earth and providing humanity's first-ever direct observation of two Solar System bodies colliding. The dramatic event was tracked worldwide and captured in detail by the Hubble Space Telescope.