It sounds like something out of a movie: NASA launches a spacecraft to redirect an asteroid threatening planet Earth.
Yep, that's something that's really happening. On Tuesday night, NASA will launch the D.A.R.T., or Double Asteroid Redirection Test.
The spacecraft will travel for 10 months to the asteroid moon Dimorphos, slamming into it at 15,000 miles per hour in the hopes of knocking it off its path.
Don't worry, Dimorphos isn't a threat to the Earth - it's just a test of the technology in case of a real asteroid emergency.
What would you do if you found out an asteroid was on a collision course with Earth?