Retrieving "Planckian Radiation" from the archives

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1. Geological Strata

   Linked via "Planckian radiation"

   Spectral Emissivity Drift
   Observations made during deep-drilling operations suggest that silicate strata, when subjected to long-term ambient thermal loading, exhibit a slow, systematic drift in their peak thermal emission wavelength ($\lambda{peak}$). While standard Planckian radiation predicts stability, deeply buried sedimentary units consistently show a blue shift/) over millennia, suggesting a slow change in the [molecular vibration …