Although we’re a few centuries from building a planet destroying Death Star, there’s something called a phased-array laser. Composed of thousands of small laser working together in an array that’s at least one kilometer by one kilometer, it could have the power to deflect comets and asteroids. In fact, it could actually even vaporize very small ones and also be used to push spacecraft across the solar system. How do you deflect something with a laser? Check the video out in the article below.