Only 12 men have ever walked on the surface of the moon.
So it's fair to say it's the most exclusive club in History.
We always remember the first...
Roger Bannister ran the first four minute mile, Margaret Thatcher was the first British female Prime-Minister, Neil Armstrong the first man on the moon.
Armstrong nearly didn't make it. You can read our 10 things you didn't know about the first Moon landing.
Here we'll tell you about the 2nd, 3rd and 4th, all the way through to number 12.
These are the men who have walked on the moon.
1. Neil Armstrong: (Moonwalker 1969) a businessman in Lebanon, Ohio
2. Buzz Aldrin: (1969) President of three companies in Los Angeles, Chairman of National Space Society.
3. Charles 'Pete' Conrad: (1969) Founder of Universal Space Line Inc, killed aged 69 in a motorbike accident in California
4.: (1969) now an Artist who paints space scenes
5. Alan Shepard: (1969) Also the first American in Space. Died in 1998 aged 74
6. Edgar Mitchell: (1971) Founder of an institute that reseraches the mind and nature of consciousness.
7. David Scott: (1971), now an aerospace consultant
8. James Irwin: (1971) Led 6 expeditions to Mount Ararat, Turkey, in search of Noah's Ark. Died in 1991.
9. John Young: (1972) Still working at NASA
10. Charles Duke: (1972), now a businessman in Texas
11. Eugene Cernan: (1972), another Texan businessman, CEO of Johnson Engineering Corp.
12. Harrison Schmitt: (1972) Former US Senator now part time teacher at University of Wisconsin
It's the holy grail for any Space collector to build a complete collection of all twelve signatures.
Few have managed it.
After all, Neil Armstrong no longer signs autographs and three of the astronauts have passed away.
But guess what?
We have a complete collection of Moonwalker signatures for sale.
It's a real achievement to complete. And a real joy to own.
You can view them.
And if you want to own the finest piece of Apollo 11 memorabilia in the world, then click.