Odds and quads
The Apollo 15 mission of July and August 1971 was the first to allow a manned spacecraft to spend an extended period of time - close to three days - on the surface of the Moon.
While the main pilot, Alfred Worden, kept the command/service module in orbit, commander David Scott and lunar module pilot James Irwin were able to make use of the new lunar roving vehicle to explore the satellite, and to spend a total of 18 and a half hours outside it collecting 77kg of scientifically valuable material.
On 9 November of the same year, the three triumphant astronauts paid a visit to what is now City University London. To commemorate the event, they presented this signed photograph of the landing site to City's chancellor (and Lord Mayor of London) Sir Peter Studd, who then gave it to the university "to include among their treasures".
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