The
Moon is the Earth's only natural satellite. The Moon
is thought to have formed nearly 4.5 billion years ago, not long after Earth.
Although there have been several hypotheses for its origin in the past, the
current most widely accepted explanation is that the Moon formed from the
debris left over after a giant impact between Earth and a Mars-sized body. The
Moon is the only celestial body other than Earth on which humans have currently
set foot. The Soviet Union's Luna programme was the first to reach the Moon
with unmanned spacecraft in 1959.
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