Moon by the Soviet Union's Luna 2, an unmanned spacecraft. The United States' NASA Apollo program achieved the only manned lunar missions to date, beginning with the first manned orbital mission by Apollo 8 in 1968, and six manned landings between 1969 and 1972, with the first being Apollo 11. These missions returned lunar rocks which have been used to develop a geological understanding of the Moon's origin, internal structure, and the Moon's later history. Since the Apollo 17 mission in 1972, the Moon has been visited only by unmanned spacecraft. Both the Moon's natural prominence in the earthly sky and
Moon landing conspiracy theories in popular culture Moon landing conspiracy theories in popular culture The notion that the Apollo Moon landings were hoaxes perpetrated by NASA and other agencies has appeared many times in popular culture. Not all references to Moon landing conspiracy theories are in support of them, but the ideas expressed in them have become a popular meme to reference, both in humor and sincerity. In 1956 James E. Gunn wrote a science fiction story entitled "Cave of Night" in which the United States Air Force fakes the first manned American spaceflight. When lack of funds precludes a survivable manned mission, the mission is faked