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Forty-five years after the first Apollo lunar landing, the United States remains divided about the moon's role in future human space exploration.
Ten more U.S. astronauts followed Neil Armstrong and Buzz Aldrin's July 20, 1969, visit to the moon before the Apollo program was canceled in 1972. No one has been back since.
Under current plans, it will be another 11 years before U.S. astronauts travel beyond the International Space Station, a permanently staffed research laboratory that flies about 260 miles above Earth. A mission to Mars is at least a decade or more beyond that – if it happens at all.