Kinetic Impact Strategies
one of the alternative strategies that may be effective in deflecting an asteroid from Earth's orbit is to send a massive spacecraft to collide with the asteroid, altering its momentum and removing it from the collision course. This strategy is currently the object of a major study and mission, called Don Quijote, by the European Space Agency. Early results from this mission have shown that it is possible, and a model of the deflection of near-Earth asteroid 99942 Apophis shows that it would only take a spacecraft with a mass of less than one ton (0.9 tonne) to deflect the asteroid out of its modeled collision course with Earth.
Continue reading here: Gravitational Tractor Strategies
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