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Start with the full category, then apply the exact boundary: Actual Jupiter orbit insertion, not a flyby or a planned arrival. Two NASA spacecraft qualify. You only need one qualifying answer. A longer name is not automatically rarer.
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JunoJuno · 45 points · 4 characters
Juno entered Jupiter orbit in July 2016.
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Galileo55 points · Shortest accepted spelling: Galileo
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- Apply the complete question boundary: Actual Jupiter orbit insertion, not a flyby or a planned arrival. Two NASA spacecraft qualify.
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Source: NASA · Jupiter exploration ↗
Reference version: 2026-10-21. See our answer policy for how we handle aliases and omissions.