Everyone knows who Neil Armstrong is and why he is famous.

Being the first person to set foot on the moon has placed him in a unique position in world history, and he is a name that people will probably remember for thousands of years.

But Apollo 11 was not his first spaceflight.

His first flight aboard Gemini 8 was, in many respects, far more exciting and impressive than his exploits on Apollo 11. Learn more about your ad choices. Visit megaphone.fm/adchoices