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  1. The 21st century BC was a century that lasted from the year 2100 BC to 2001 BC.. Events

  2. Project Horizon was a 1959 study to determine the feasibility of constructing a scientific / military base on the Moon, at a time when the U.S. Department of the Army, Department of the Navy, and Department of the Air Force had total responsibility for U.S. space program plans.

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