Speculative physics explores the number of human-like civilizations and cosmic factors influencing life.
This speculative-physics white paper estimates how many human-like technological civilizations the universe could ever have produced, and asks whether that number is even knowable. It traces the cosmic production of the elements of life — light nuclei in the first three minutes, neutral atoms at 380,000 years, the first carbon at a few ×10⁸ years once stars have formed and died, and metal-rich habitable worlds over the following billions of years. A cumulative census, N_ever ≈ N_star · f_p · n_e · f_ℓ · f_i, is evaluated under pessimistic, Copernican, and optimistic readings; the result spans roughly thirty-seven orders of magnitude, with nearly all of the uncertainty in two biologically unconstrained factors. A dedicated section shows that the question “are we alone?” fractures into sub-questions with different fates: answerable as a yes but never as a no, ill-posed in the present tense, and sealed beyond the cosmic horizon. Candid status: the parent “Euler Universe” cosmology is falsified by four independent observational tests (Type Ia supernova time dilation, the CMB blackbody spectrum, the Tolman surface-brightness test, and event-envelope stretching). The phase framework is used only as an organizing lens, never as replacement physics; the central original point is that the static, no-expansion reading produces no carbon, so a non-zero count is itself evidence for cosmic expansion. Part of the Euler Universe series.
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Nicholas Archer Sanders (2026) studied this question.
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