Last week I had a interview with Andrew Rader, a rocket scientist at Space X. We had a two question interview via email. I learned about Whipple Shields, they reflect off micrometeorites that fly 10 times faster than a bullet. If micrometeorites hit a spacecraft, it could rip out a huge hole in the spacecraft. He also gave me a link about Whipple Shields on Wikipedia which gave me much more information.