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The astronaut Rusty Schweickart made a spacewalk
in order to test an emergency procedure,
in case the
Apollo capsule and lunar module failed to connect.
However,
as the test began, there was a delay
due to a technical problem,
and as a consequence, Rusty had five minutes in space on his own
whilst it was being fixed.
Although the astronauts hadn't been briefed to take photographs, when Rusty saw the Earth hanging in space, he was so [awestruck] that he immediately captured it on camera. Not only did these images affect the astronauts deeply, they also had a profound effect on the rest of mankind.