Earthquake, hurricane, what's next? Oh, right, an asteroid, but don't worry, MIT has an answer for that

And that answer is paintballs:

Sung Wook Paek SM '12, a graduate student in MIT's Department of Aeronautics and Astronautics, says if timed just right, pellets full of paint powder, launched in two rounds from a spacecraft at relatively close distance, would cover the front and back of an asteroid, more than doubling its reflectivity, or albedo. The initial force from the pellets would bump an asteroid off course; over time, the sun's photons would deflect the asteroid even more.

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    ...all you need is PAINT to increase your albedo?

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