However, since the universe contains the cosmic microwave background radiation, in order for the black hole to dissipate, the black hole must have a temperature greater than that of the present-day blackbody radiation of the universe of 2.7 K. In 2020, Chou proposed a theory if a Pluto-mass rotating radiating primordial black hole, the Hawking radiation temperature will be 9.42 K, higher than 2.7 K CMB. Other study suggest that must be less than 0.8% of the mass of the Earth – approximately the mass of the Moon.