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Celebrate Apollo!

Apollo 15 was the ninth manned mission in the American Apollo space program, the fourth to land on the Moon and the eighth successful manned mission. It was the first of what were termed "J missions", long duration stays on the Moon with a greater focus on science than had been possible on previous missions. It was also the first mission where the Lunar Roving Vehicle was used.

The mission began on July 26, 1971, and concluded on August 7. At the time, NASA called it the most successful manned flight ever achieved. The 'Falcon' landed on the moon July 30, 1971 at 22:16:29 UTC. Commander David Scott and Lunar Module Pilot James Irwin spent 2 days and 18 hours on the Moon and a total of 18½ hours outside the spacecraft on lunar extra-vehicular activity. The mission was the first not to land in a lunar mare, instead landing near Hadley rille in an area of the Mare Imbrium called Palus Putredinus (Marsh of Decay). The crew explored the area using the first Lunar Rover, allowing them to travel much farther from the Lunar Module lander than had previously been possible. The vehicle traversed a total of 27.9 km (17 mi). They collected a total of 77 kg (170 lbs) of lunar surface material. At the same time, Command Module Pilot Alfred Worden orbited the Moon, using a Scientific Instrument Module (SIM) in the Service Module to study the lunar surface and environment in great detail with a panoramic camera, gamma ray spectrometer, mapping camera, laser altimeter, mass spectrometer, and lunar sub-satellite deployed at the end of Apollo 15's stay in lunar orbit (an Apollo program first).

After lifting off from the lunar surface the LM ascent stage rendezvoused and re-docked with the CSM with Al Worden aboard in orbit. After transferring samples and other items from the LM to the CSM, the LM was sealed off, jettisoned, and intentionally crashed into the lunar surface. After completing more observations of the Moon from orbit and releasing the sub-satellite, the three-person crew departed lunar orbit with another burn of the SPS engine.

The next day, on the return trip to Earth, Al Worden performed a spacewalk in deep space, the first of its kind, to retrieve exposed film from the SIM bay. Later on in the day, the crew set an endurance record for Apollo program, becoming the longest Apollo spaceflight to that point.

On approach to Earth the next day, August 7, the Service Module (SM) was jettisoned, and the Command Module (CM) reentered the Earth's atmosphere. Although one of the three parachutes on the CM failed to deploy properly, only two were required for a safe landing (one extra for redundancy). Upon landing in the North Pacific Ocean, the crew were recovered and taken aboard the recovery ship, the USS Okinawa after a mission lasting 12 days, 7 hours, 11 minutes, and 33 seconds.

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