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Down-Sun picture of the RTG with the Central Station in the background. The fins on the RTG provide radiative cooling. Note the relatively large amount of dust that has been kicked on to the RTG. The smaller object in the background is the LRRR. The mortar pack is at the right edge. Apollo 14 was the third mission in which humans walked on the lunar surface and returned to Earth. On 5 February 1971 two astronauts (Apollo 14 Commander Alan B. Shepard, Jr. and LM pilot Edgar D. Mitchell) landed near Fra Mauro crater on the Moon in the Lunar Module (LM) while the Command and Service Module (CSM) (with CM pilot Stuart A. Roosa) continued in lunar orbit. During their stay on the Moon, the astronauts set up scientific experiments, took photographs, and collected lunar samples. The LM took off from the Moon on 6 February and the astronauts returned to Earth on 9 February. (KEYSTONE/SCIENCE PHOTO/NASA / Science Source) === ===