Scientists involved in the project to protect the Earth from the threat of falling meteorites NEOShield, proposed the creation of a system of satellites bombers that a collision will change the trajectory of small celestial bodies. The process is divided into 3 phases: detection, threats analysis and its elimination. For the last step, of course, you need a lot of energy here, scientists have proposed to use disposable devices accelerated to enormous speeds. Currently, employees NEOShield able to accelerate millimeter to more than 22,000 miles per hour.
Read another very interesting article about alternative energy of the Sun, water and air.