A brief video of a tornado on the surface of the sun posted by NPR, as seen by NASA's Solar Dynamics Observatory (links to various sizes and qualities of downloads here). The tornado is larger than Earth itself and has gusts up to 300,000 miles per hour.
Amateur video footage of the Challenger explosion previously unknown, has now been found and, of course, posted to YouTube. A retired man named Jack Moss was taping the launch from his front yard when the explosion occurred moments into the launch. The tape was relegated to his basement and forgotten, and Moss died late last year. His pastor remembered a conversation about the video and found it among other old Betamax videotapes from the same period. It is believed to be the only amateur footage of the event.