These fragments collided with Jupiter 's southern hemisphere between July 16 and July 22 , 1994 , at a speed of approximately 60 km\/s . The prominent scars from the impacts were more easily visible than the Great Red Spot and persisted for many months . These fragments collided with Jupiter 's southern hemisphere between July 16 and July 22 , 1994 , at a speed of approximately 60 k. The prominent scars from the impacts were more easily visible than the Great Red Spot and persisted for many months .