knowledge of history knows those words by heart, right? but a lot of people are at the johnson space center in houston today to commemorate the men and the mission of apollo 11. the fact is, that moment still inspires us. it still sends a chill up the spine of anyone who was alive and watching that grainy footage live on that hot july night 50 years ago either from mission control or their living room. a little boy named mike was just 6 years old that night. almost 40 years later, astro mike sent the first tweet from space on may 12th, 2009, writing, from orbit, launch was awesome. i am feeling great, working hard, and enjoying the magnificent views, the adventure of a lifetime has begun. astro mike is former nasa astronaut and you probably know him from "the big bang theory." >> great to be here. thanks for mentioning the tweet. i think it fails in comparison