Mercury has been devoid of human-built companions since April 2015, and while the next spacecraft bound for the innermost planet launches in October, it won't arrive until 2025.
What Would It Take to Land on Mercury? It's Time to Find Out, Scientists Say
SPACE.com - 30 Aug 2018 13:00
Mercury has been devoid of human-built companions since April 2015, and while the next spacecraft bound for the innermost planet launches in October, it won't arrive until 2025.
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