May 31, 2013 – SPACE - If a dangerous asteroid appears to be on a
collision course for Earth, one option is to send a spacecraft to
destroy it with a nuclear warhead. Such a mission, which would cost
about $1 billion, could be developed from work NASA is already funding, a
prominent asteroid defense expert says. Bong Wie, director of the
Asteroid Deflection Research Center at Iowa State Universit
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