For the past several years, the generally accepted story of the demise of the dinosaurs included a worldwide firestorm as tiny, hot pieces of earth were thrown up by the asteroid impact that caused the Chicxulub crater off the modern Yucatan. Those pieces were supposed to have ignited forests around the world as they landed.
A new computer model suggests, however, that most of those pieces did not land immediately. Instead, they formed an opaque cloud well up in the atmosphere that actually blocked other pieces from hitting the surface. The world did heat up, according to this model, but not as much as the accepted theory holds, and there was no worldwide firestorm.
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