... Jupiter s Impact Scar . ... Credit: Anthony Wesley Explanation: In July of 1994 pieces of Comet Shoemaker-Levy 9 collided with planet Jupiter. The explosive impacts sent plumes of debris high into the Jovian atmosphere creating dark markings or scars , visible for a time against the cloud bands. ... NASA's Infrared Telescope Facility images from Mauna Kea, Hawaii later confirmed the likely impact site's dark scar and plume of particles in Jupiter's upper atmosphere. ... July . ... July 2009 . ...