Moon Walk

7/21/2009 1:59 AM PDT

Moon Walk

Aldrin, 79, Collins, 78, and Armstrong, 78, resurfaced at an event commemorating their historic space flight on Sunday, looking out of this world.

In his memoir, Aldrin discussed his post-NASA career battles with depression and alcoholism.

Collins never actually walked on the moon.

Armstrong uttered the famous line, "One small step for man, one giant leap for mankind."