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San Francisco, 12:14 PM
Sun Dec 27
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Potentially Deadly Asteroids Still Go Undetected
Although NASA vigilantly searches the skies, dozens of near-Earth asteroids remain undetected, any one of which could strike our planet and cause devastating damage. But better detection will mean more facilities and better equipment — and a lot more money. More »The Comet that Destroyed America
Dinosaurs may not have been Earth's only creatures to face extinction from above. A team of researchers has found evidence that suggests a comet once hit North America, taking the continent's mammals down with it. More »10 Scariest Asteroid Attacks on Earth: The Near Hits and Approaching Terrors