The sky is falling, really
March 19, 2007 | Source: International Herald Tribune
Two potential deflection techniques for asteroids appear to work nicely together.
First we would deflect the asteroid with kinetic impact from a missile (that is, running into it); then we would use the slight pull of a “gravity tractor” a satellite that would hover near the asteroid — to fine-tune its new trajectory to our liking.
The bad news? NASA doesn’t plan to do it.