The Outer Limits of Humanity

Use the URL: http://www.squarespace.com/nutshell for 10% with a new website and support this channel. Also make your life easier. Thanks a lot to Squarespace for supporting the show! Check out Ethan Siegels Astronomy blog, "starts with a bang": http://onforb.es/1THyMGT Is there a border we will never cross?

Is there a border that humans will never cross? Are there places we will never be able to reach, no matter what? It turns out there are. Far, far more than you might have thought…