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Tranquility Base
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<p>Tranquility Base is the site on the <a href="/facts/Moon/zKHqEMPb">Moon</a> where, in July 1969, humans landed and walked on a <a href="/facts/Celestial_body/BCHLa0Q2">celestial body</a> other than <a href="/facts/Earth/HLLmDfj0">Earth</a> for the first time. On July 20, 1969, <a href="/facts/Apollo_11/BdUKVnQP">Apollo 11</a> crewmembers <a href="/facts/Neil_Armstrong/3aoQV60l">Neil Armstrong</a> and <a href="/facts/Buzz_Aldrin/meuu82u7">Buzz Aldrin</a> landed their <a href="/facts/Apollo_Lunar_Module/XtvQS5K5">Apollo Lunar Module</a> <i><a href="/facts/Lunar_Module_Eagle/f4u9uoAK">Eagle</a></i> at approximately 20:17:40 <a href="/facts/Universal_Coordinated_Time/2EnjfSyu">UTC</a>. Armstrong exited the spacecraft six hours and 39 minutes after touchdown, followed 19 minutes later by Aldrin. The <a href="/facts/Astronauts/HB1bd6Lz">astronauts</a> spent two hours and 31 minutes examining and photographing the lunar surface, setting up several scientific experiment packages, and collecting 47.5 pounds (21.5 kg) of <a href="/facts/Moon_rocks/DMJbMMG1">dirt and rock samples</a> for return to Earth. They lifted off the surface on July 21 at 17:54 UTC. </p><p>Tranquility Base was named by Aldrin and Armstrong, and first announced by Armstrong when the <a href="/facts/Lunar_Module_Eagle/f4u9uoAK">Lunar Module <i>Eagle</i></a> landed. It is located in the south-western corner of the dark lunar plain <a href="/facts/Mare_Tranquillitatis/hmhxz70j">Mare Tranquillitatis</a> ("Sea of Tranquility"). The U.S. states of <a href="/facts/California/zLW2vdQJ">California</a> and <a href="/facts/New_Mexico/wosJCGaW">New Mexico</a> have registered Tranquility Base as a heritage site associated with them, but <a href="/facts/Texas/B987WHF0">Texas</a>, the U.S. <a href="/facts/National_Park_Service/KyR15FW6">National Park Service</a>, and <a href="/facts/United_Nations_Educational%2c_Scientific_and_Cultural_Organization/QSbkRv3o">UNESCO</a> have declined to do so, due to the technicality that it is not located within their borders. </p>