The dinosaurs went extinct because they didn't have a space program. We do have on. Planetary Defenders is a new documentary that takes you inside NASA’s real-life mission to find near-Earth asteroids that could pose a threat to Earth. Streaming on NASA+ and NASA YouTube April 16. NASA+: https://plus.nasa.gov/ NASA YouTube: https://www.youtube.com/NASA NASA's Planetary Defense Program: https://science.nasa.gov/planetary-defense/ Producers: Jessie Wilde and Scott Bednar Editor: Jessie Wilde Motion Graphics Editor: Matthew Schara Credit: NASA