NASA astronauts perform spacewalk outside the international space station - USA TODAY

Add Videos or PhotosBe first to contribute

Sign in now to share your story.

Sign in with FacebookSign in with Google+

Be first to contribute

Verifying your credentials...

Please wait.

Uh oh!

We're experiencing a few technical issues.

Try again

Source : http://www.usatoday.com/videos/tech/sciencefair/2014/04/23/8054059/