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
To the Moon Johnny's dying wish of going to the moon. Eventually, it is revealed that Johnny and River met as children at a carnival. They looked at the night sky and made up a constellation: a rabbit with the moon as its belly. The two agreed to meet at the same place the following year, with Johnny promising that should he forget or get lost, the two would "regroup on the moon". That night, Johnny gives River a toy platypus which River treasures for the rest of her life. Shortly after, Johnny's twin brother Joey was killed in an accident. Johnny's mother