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science1d ago
Sealed in an Envelope for a Decade, Another Surprise in the Quest to Unravel the Mystery of Gravity Emerges
- NIST completes a decade-long effort to reproduce the 2007 gravity measurement, seeking alignment with the BIPM result.
- The study identifies a spurious torque from tiny temperature gradients and residual gas affecting the vacuum chamber.
- Despite adjustments bringing results closer to the French measurements, a small remaining discrepancy persists.
- Schlamminger notes the near-term impact on the reproducibility of big G experiments and the need for careful uncertainty accounting.
- The team presented an updated redetermination of G, published in Metrologia, with conclusions about the limits of current precision.
- Schlamminger underscores a key principle of scientific work: remaining open to literature while pushing boundaries.
- The envelope experiment was designed to guard against bias by delaying data adjustments.
- The 2026 Metrologia paper details how a brand-new effect could bias gravity measurements.
- The Debrief reporter Ryan Whalen provides context on the gravity mystery and experimental history.
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