The Lunar Ranger program was a series of missions by the United States to photograph and then impact on the moon. Rangers 1-5 (August 1961- October 1962) failed. Ranger 6 succeeded in hitting the moon, although the television camera failed. Rangers 7, 8, and 9 (july 964-March 1965) succeeded. A secondary objective of the early Ranger missions, to hard-land a small seismometer on the moon, was not successful.
The lesson of the early Ranger failures is to keep on trying.
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- List of Robotic Missions to the moon