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Callisto: By Kelvinsong, CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0/, https://commons.wikimedia.org/w/index.php?curid=31643955
UV disinfection unit: By Z22, CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0, https://commons.wikimedia.org/w/index.php?curid=112466689
Europa: By Kevin Gill – https://flic.kr/p/tQh5j7, CC BY-SA 2.0 https://creativecommons.org/licenses/by-sa/2.0, https://commons.wikimedia.org/w/index.php?curid=42599048
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