NASA has a plan for preventing asteroid strikes, and it’s going to test it

The threat of an asteroid striking Earth is pretty scary — and not just in all the ways Hollywood movies have depicted — but human technology has reached a point where it might actually be possible for us to prevent an asteroid impact if we see one headed our way. NASA has a concept for a tool that could do the trick. It's called the DART (short for Double Asteroid Redirection Test), and the agency is finally moving forward with its plan to design and hopefully build the hardware tha