The two astronauts practising placing experiments on the Moon. Apollo 13, with astronauts Lovell, John Swigert and Haise aboard, was launched on 11th April 1970 on what was intended to be the third manned Moon landing mision. The mision had to be abandoned after an explosion in the Service Module just over halfway to the Moon. The astronauts returned safely to Earth after a forced trans-lunar flight.
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