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It would take an extremely large spacecraft to deflect a large asteroid that would be headed directly for the Earth.

Rusty Schweickart
Earth, Asteroids, Would Be
"Nudging Killer Asteroids Off Course". "All Things Considered" with Nell Greenfieldboyce, www.npr.org. November 10, 2005.
It would take an extremely large spacecraft to deflect a large asteroid that would be headed directly for the Earth.