NASA Astronauts Greg Johnson (left), and Mike Forman (right) take part in the NASA Tweetup following the "Celebrating John Glenn's Legacy: 50 Years of Americans in Orbit 1962 - 2012" event at Cleveland State University on March 2, 2012 which honored the Senator's lifetime of achievements.   Mike Lynaugh

NASA Astronauts Greg Johnson (left), and Mike Forman (right) take part in the NASA Tweetup following the "Celebrating John Glenn's Legacy: 50 Years of Americans in Orbit 1962 - 2012" event at Cleveland State University on March 2, 2012 which honored the Senator's lifetime of achievements.

Mike Lynaugh