Deflecting Asteroids

Very relevant to recent events, courtesy of Emma S.:

This is an article about a possible way of destroying asteroids that is being developed. Basically it talks about something called the Yarkovsky effect (how thermal radiation can create a force that can change the trajectory of an asteroid), and how painting asteroids (or, rather, spraying them with powder) can alter their course slightly. 

Article at: http://www.wired.com/wiredscience/2013/02/painting-asteroids/