Think returning to the United States from the moon would be easier than returning from another country? Just ask Buzz Aldrin and Neil Armstrong. When they returned to Earth after their historic Apollo 11 journey to the moon, they were subject to quarantine for 21 days. The measure was a precaution in case they brought back interstellar diseases. The pioneering astronauts even had to go through customs, just like people who travel from one country to another. Aldrin is now revealing some of his Apollo 11 documents on Twitter and Facebook.