those first steps on the moon, obviously, those are important. then there's also the audio. 11,000 hours of audio from these moments. they do offer new perspectives on what the crew and mission control were experiencing in real time. let's listen. >> how far are my feet? >> you are at the edge of the porch. >> i want to back up and partially close the hatch. making sure not to lock it on my way out. >> good thought. >> it's our home for the next couple hours. we want to take good care of it. >> you have three more steps and then a long one. >> beautiful. >> magnificent sight. >> magnificent. >> what did you learn about this mission you didn't already know?