Between the two of them, NASANational Aeronautics and Space Administration astronauts Randy Bresnik and Jack Fischer have completed seven spacewalks lasting nearly 40 hours. Did you ever wonder what it is really like to “walk” outside the International Space Station as it orbits the Earth? If you do, you could have the opportunity to ask and learn during a Facebook Live on Tuesday, Feb. 20 at 9:00 a.m.