25 Years Since Comets Collide with Jupiter | Shoemaker-Levy 9

25 years ago, humanity had its first glimpse of a cosmic collision when comet Shoemaker-Levy 9 crashed into Jupiter — and the whole world watched. We’ve seen evidence of impacts all throughout our solar system, but we had never before been able to watch an impact while it was happening. And, it was a wake-up call… Today NASA’s Planetary Defense Coordination Office has its eyes to the sky detecting and tracking potentially hazardous and near-Earth objects. Explore more: http://www.nasa.gov/planetarydefense