3. •By NASA Ames Resarch Center (NASA-ARC) (NIX A-28284) [Public domain], via Wikimedia Commons
•By Dezignr (Own work) [GFDL (http://www.gnu.org/copyleft/fdl.html), CC
•-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0/) or FAL], via Wikimedia Commons
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eft/fdl.html) or CC-BY-3.0 (http://creativecommons.org/license
s/by/3.0)], via Wikimedia Commons
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