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Controlling it ten times better requires both temperature control and better atomic theory.","posed_since":"","precise":"Determine the room-temperature (300 K) blackbody shift of the Sr (or Yb) 1S0-3P0 lattice-clock transition, including the dynamic correction from the frequency dependence of the differential polarizability, with fractional uncertainty below $10^{-19}$, and the effective radiation temperature seen by the atoms to 10 mK.","problem_ref":"ad2186ee21e8027da2db626cd3c0fcc66f460183bebd5f91ef022b6762ab80ba","references":"","settled_by":"Measurement of the differential dynamic polarizability at mid-infrared frequencies combined with in-vacuum thermometry, or cryogenic clock operation that verifies the shift scaling with $T^{4}$ and $T^{6}$.","status_note":"","title":"Blackbody radiation shift of lattice clocks at the $10^{-19}$ 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