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Their best result so far is about ten times less precise than needed.","posed_since":"","precise":"Atom-interferometric gravity gradiometry with well-characterized source masses gave G with about 150 ppm uncertainty (Rosi et al 2014). Determine G with uncertainty below $10^{-5}$ relative by a cold-atom method, sufficient to discriminate among the discrepant macroscopic results.","problem_ref":"12410c9ef41276fbf05bf7ebc5e08c8a7cfe1ee5d11586a009f6cbc1545de302","references":"","settled_by":"A cold-atom G measurement with total uncertainty below 10 ppm and a published complete error budget.","status_note":"","title":"Atom interferometry determination of G at 10 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