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Start with the full category, then apply the exact boundary: The five probes in NASA’s Voyager FAQ. An escape trajectory is not the same as having crossed into interstellar space. You only need one qualifying answer. A longer name is not automatically rarer.
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Pioneer XPioneer 10 · 80 points · 9 characters
Pioneer 10 passed Jupiter and continued on an escape trajectory.
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Pioneer 1185 points · Shortest accepted spelling: Pioneer 11
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- Apply the complete question boundary: The five probes in NASA’s Voyager FAQ. An escape trajectory is not the same as having crossed into interstellar space.
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Source: NASA · Voyager frequently asked questions ↗
Reference version: 2026-10-21. See our answer policy for how we handle aliases and omissions.