I'm sure you've seen the world's most famous photograph, "Earthrise". It's been on the cover of TIME and on stamps. But did you know it almost didn't happen? This occurred over 45 years ago, on Christmas Eve, 1968. The site below is outstanding. It takes you right onto the module with the 3 astronauts and you hear them as they see it for the first time. (It begins occurring around 3 minutes, 38 seconds.) Just think we were alive and watching when this happened. A picture like this, taken by a human, is not likely to happen again even in the distant future.