Hubble sphere, 14.5 Gly · its Schwarzschild radius, 14.5 Gly
r_s / R_H = 1.000000
(flat universe, any epoch: it is algebra)
Observable universe, 46.5 Gly · its Schwarzschild radius, 480 Gly, off the page
r_s / R = 10.3
(move the edge and the coincidence is gone)
Floor II · 2026-09-26 · to scale, 1 px = 0.28 Gly · H0 = 67.4, Ω = 1
···