50 years ago, humanity's first steps on another world

Fifty years ago on Saturday, American astronauts Neil Armstrong and Buzz Aldrin became the first humans in history to set foot on the Moon, an event watched on television by half a billion people.

The exploration of space in 10 key dates

From the Soviet Union's pioneering satellite to the first man on the Moon 50 years ago, here are 10 key dates in space exploration.

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