Buzz Aldrin -- No More Space for Me!

If you think Felix Baumgartner's leap from space got Buzz Aldrin's astronaut juices flowing, think again -- the legendary spaceman says he's done visiting the Final Frontier.

Our photog caught up with Aldrin yesterday at LAX, where he showed he's still razor sharp ... referring to Baumgartner's record-setting jump as "One giant leap for Red Bull."

But when the topic of Aldrin returning to space came up -- Mars, perhaps? -- the 82-year-old said he's hung up his moon boots for good.