A felt-tip pen that helped astronauts Neil Armstrong and Buzz Aldrin return to their space capsule after their first moonwalk has been sold for $857,600. The pen was used to fix a broken switch, which allowed the astronauts to reactivate their engine and return home. The Apollo 11 mission was the first time people walked on the Moon, and it was a big deal! Neil Armstrong was the first man on the Moon, and he said, 'That's one small step for man, one giant leap for mankind.'