Summary: In this video clip, see why an explosion three miles above Earth would act like a white-hot tornado on the surface. Watch NOVA Wednesday nights on PBS. Or join us online at pbs.org/nova. Funding for NOVA is provided by David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, Lockheed Martin Corporation, and PBS viewers. To learn more, visit http://www.pbs.org/nova/clovis
