Science / Research Record
A sphere smoother than a planet
A laboratory sphere, imagined at Earth’s size, with only metres of relief.
Inside this record
A precise scale comparison, the metrology source behind it, and the distinction between smoothness and measurement uncertainty.
- A precise, usable claim
- Concise explanation and context
- Linked supporting sources
- Material caveats and a research note
Source check: 2026-10-07. Source: NIST.
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