>> because neil armstrong landed the eagle with what nasa said later was just 30 seconds of fuel left in the tank. >> wow. it's been 50 years since "apollo 11" landed on the moon, and to celebrate, there's a projection -- this was so cool. the "saturn 5" rocket on the washington monument in d.c. back in 1969, more than a half billion people watched on tv as armstrong stepped down the ladder and said the line we all know. listen -- >> that's one small step for man, one giant leap for mankind. >> joining us now, a man who knows what it's like to go into space. retired astronaut leroy chow. good morning to you. >> good morning. >> we've spent the last 50 years celebrating the successful landing. it's really hard to imagine that