We have that Λ ∼ a20∕c2 if expressed in inverse time-squared or Λ ∼ a20∕c4 if expressed in inverse length-squared (more precisely, the natural scale associated with the cosmological constant is ∘ - a0 ≈ (c2∕2π) (Λ ∕3)). Another way of expressing this coincidence is to say that predictions of GR from visible matter alone always break down for physics involving a length-scale constant on the order of the Hubble radius l ∼ Λ−1∕2 ∼ c2∕a0. This scale l could perhaps play a similar role to the Planck scale lP [233Jump To The Next Citation Point, 43], at the other end of the ladder (as we have l ≈ 1060lP ). However, this is not the length at which the modification would be seen, exactly as quantum mechanics does not depart from classical physics at a given length.