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has been collecting earth dust on a shelf in california until now. its discovery makes this our favorite story of the day. here is abc s david muir. reporter: we have long been fascinated by the moon. almost a quarter million miles away, admiring it from a distance until that summer night, july 16, 1969 in that historic mission to the moon. 10, 9, ignition sequence start. reporter: apollo 11 lifts off from cape canaveral carrying neil armstrong and buzz aldrin. four days later in those words. it s one small step for man, one giant leap for mankind. reporter: he would spend two hours 21 minutes walking in the lunar dust, raising the american flag. later, armstrong thought landing on the moon not walking on it was far more challenging. to the right a little. reporter: but he also did something else.