Part II · The Plenum · Paper 9 of 40
“A thermometer reading, the Stefan–Boltzmann law, and E = mc² give space a mass-equivalent density of 4.645 × 10⁻³¹ kg/m³. That is arithmetic, not hypothesis.”
The quantitative case. It also states two limits plainly: the total vacuum energy is not known, exceeding observation by a factor of 10¹²³, and the framework constrains a ratio rather than an absolute density. The Plenum is real and measured. Its identification with this value remains open.