National Security

October 16, 2013 6:00 AM

With need for nuclear weapons questioned, builders find a new target – errant asteroids

When geophysicist H. Jay Melosh attended a meeting of U.S. and ex-Soviet nuclear weapons designers in May 1995, he was surprised by how eager the Cold Warriors were to work together against an unlikely but dangerous extraterrestrial threat: asteroids on a collision course with Earth.

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