Once the asteroids are spotted and their orbits determined, an earthbound asteroid can be nudged slightly off course with a satellite deflector or a high velocity projectile, or blown up with nuclear weapons, causing it to miss its deadly rendezvous.
Source: tatoeba (11234657)
1992 Nasa Patents Available for Licensing from the George C. Marshall Space Flight Center
The deflector assembly contains a plurality of vanes which change the direction of the solar energy to the vertical, while constantly keeping the same side of the deflector facing the sun.
Source: wiktionary
The blasters are those beams of ravening destruction which take care of recalcitrant meteorites in a spaceship's course when the deflectors can't handle them.
Source: wiktionary
Deflectors say there's something there, sensors say there isn't. Density negative. Radiation negative. Energy negative.
Source: wiktionary
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