Shadowy Jumping Factoids

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Question 1: Mons Huygens on Luna is 4.7 kilometers high. Yet, if I were on Luna wearing a lunar excursion suit, it would be a reasonable expectation that I would be able to jump higher than Mons Huygens. Why is that?
Question 2: What is over 2000 miles across and weighs nothing?
Answer 1: Even if I could jump only 10 centimeters over the regolith surface of Luna I could jump higher than Mons Huygens because Mons Huygens cannot jump at all.
Answer 2: There is something that is 2000 miles across, weighs nothing and stretches a quarter of a million miles from Luna to Earth on occasion, the shadow of Luna.