On this day 45 years ago, Apollo 11 launched the Saturn V rocket that would take three men to the moon.
It was July 16, 1969, when NASA launched Neil Armstrong, Buzz Aldrin, and Michael Collins into space.
It would take the three men just 4 days to travel around a quarter of a million miles from Earth to the moon.
The launch was broadcast on all three major networks at the time.
Now, the second man to set foot on the moon has a new mission.
Buzz Aldrin is encouraging people to take part in a social media campaign under the hashtag #APOLLO45.
He has invited others to share their stories of the Apollo missions. He wants people to tell him where they were the day they jumped on the moon, or what the Apollo missions mean to them.
Many already have, on the Apollo 45 YouTube channel and on Twitter, including several celebrities.
If you want to take part, take a look at this video, and share your thoughts online with the hashtag #Apollo45
Buzz Aldrin's Apollo45 page: http://wfts.tv/1rqFupj
Twitter: #Apollo45 http://wfts.tv/1nvXCsH
Facebook: #Apollo45 http://wfts.tv/1p7Cbks
YouTube: #Apollo45 http://wfts.tv/1mU7D7i