On 21 July 1969, Neil Armstrong swung open the hatch of his spacecraft and clambered down a short ladder towards the surface of the moon. The Apollo 11 moon mission came only 66 years after Orville Wright made the first successful flight in an aeroplane. Armstrong captured a sense of that progression in the indelible first words he spoke on the lunar surface: “That’s one small step for man, one giant leap for mankind.”
That was nearly 57 years ago. No human has visited the moon since the crew of Apollo 17 in 1972.
