Space and Astronomy Atlas

How The Universe Works
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Open Questions

The genuinely unresolved questions this atlas records rather than silently resolves: disputed classifications such as Pluto's 2006 reclassification as a dwarf planet, contested mission outcomes, and other places where working scientists and historians of spaceflight do not agree. An open question is recorded with both readings stated rather than settled by editorial fiat, per this atlas's own voice standard.

Open Questions
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