Speculation on this possibility was first proposed by science fiction writers—a good example is The Big Eye by Max Simon Ehrlich (1950). Since the development of rocket technology (say, since WWII), several scenarios have been proposed. At first, it was though the such a meteor could be met with an explosive rocket that would break it into tiny pieces—this possibility was discarded when scientists found that the pieces would pose as devastating an effect as the chunk itself. More recently, with the refinement of satellites and planet/moon exploratory robots, a proposal has been voiced to land a strong device (rockets or explosives) onto the surface of the asteroid that would simply change its course slightly but enough to miss the Earth. The whole subject is fueled by fear-based "end-of-the-world" theorists.
Hello! Thanks for posting your question.
First of all do you know that on April 23 2027 an asteroid called 2004 MN4 can hit Earth.
So, only less than 15 years to go.
The scientists and astronauts are planing to activate nuclear bombs in the asteroid. They will send some robotic probes to the asteroids to fit the nuclear bombs which will change the path of the asteroid to other direction.
Rossetta and Stardust are some probes.