Will Earth eventually be destroyed by an asteroid apocalypse? Michio Kaku attempts to answer that question in this week's issue of Newsweek Global. In the wake of the recent cosmic crash in Russia, Kaku suggests it unwise to ignore evidence that extra-large asteroids, so-called nation busters, lurk above us. One of the most dangerous, Apophis, measures at 1,000 feet and is expected to graze Earth's atmosphere in 2029. "If Apophis hits Earth," Kaku writes, "it would have the force of approximately 20,000 Hiroshima bombs."
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