| http://www.w3.org/ns/prov#value | - It would take less delta-v to get a powered descent to Pluto's surface, and it just may be desirable to use that thin atmosphere to help more.Dismissing the Sun, Mercury is the hardest place to fly to in terms of delta-v, and it has no atmosphere to help with a landing, so in two out of three categories, it is the hardest place to land.
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