Believers in a controversial theory about the universe are having a field day in the wake of NASA's Deep Impact comet collision. Proponents of the Electric Universe model claim that comets are not "dirty iceballs", but asteroid-like rocks that contain little ice at all. Negatively charged with electricity, their motion through the positively charged solar wind triggers electrical discharges. These, not vaporized ice, produce the characteristic comet glow and tail. Before Deep Impact struck comet Tempel 1 on July 4, Electric Universe theorists predicted that there would be two impact flashes: a small flash as the projectile penetrated the comet's electrified atmosphere, followed by a huge impact flash that would be "unexpectedly energetic." Much to the chagrin of NASA scientists, that's exactly what happened.
The Electric Universe Theory
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