When Neil Armstrong first set foot on the moon in 1969, everyone knows his famous line, but there's been some debate about what he actually said. Most people hear it as, "That's one small step for ...

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Before Neil Armstrong's legendary first steps on the ... Ranger 9 may not have left a footprint, but its crash landing helped make one small step for man, one giant leap for mankind possible.

Watch: NASA zooms in on Neil Armstrong's footprints 50 years after he walked on Moon Recollecting the day 50 years ago when Neil Armstrong walked on the Moon, NASA stated, "In a harrowing descent ...