Since success was obtained in 1969 with the sixth Saturn V on Apollo 11, nine rockets remained available for a hoped-for total of ten landings. In 1962, NASA contracted for the construction of fifteen Saturn V rockets to achieve the Apollo program's goal of a crewed landing on the Moon by 1970 at the time no one knew how many missions this would require. The mission also saw the collection of the Genesis Rock, thought to be part of the Moon's early crust, and Scott's use of a hammer and a feather to validate Galileo's theory that when there is no air resistance, objects fall at the same rate due to gravity regardless of their mass. The members of the crew were reprimanded for poor judgment, and did not fly in space again. The mission accomplished its goals but was marred by negative publicity the following year when it emerged that the crew had carried unauthorized postal covers to the lunar surface, some of which were sold by a West German stamp dealer. The Apollo 15 mission splashed down safely on August 7 despite the loss of one of its three parachutes. During the return trip, Worden performed the first spacewalk in deep space. The lunar module returned safely to the command module and, at the end of Apollo 15's 74th lunar orbit, the engine was fired for the journey home. This suite of instruments collected data on the Moon and its environment using a panoramic camera, a gamma-ray spectrometer, a mapping camera, a laser altimeter, a mass spectrometer, and a lunar subsatellite deployed at the end of the moonwalks. They spent 18 1⁄ 2 hours on the Moon's surface on extravehicular activity (EVA), and collected 170 pounds (77 kg) of surface material.Īt the same time, Command Module Pilot Alfred Worden orbited the Moon, operating the sensors in the scientific instrument module (SIM) bay of the service module. Commander David Scott and Lunar Module Pilot James Irwin landed near Hadley Rille and explored the local area using the rover, allowing them to travel further from the lunar module than had been possible on previous missions. The mission began on July 26 and ended on August 7, with the lunar surface exploration taking place between July 30 and August 2. Apollo 15 saw the first use of the Lunar Roving Vehicle.
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It was the first J mission, with a longer stay on the Moon and a greater focus on science than earlier landings. 1 in cislunar space and 4 on the lunar surface
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