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Possibly, a philosopher of science is expected to ask this question — not a theoretical physicist. Nevertheless, an inquiry into the nature of a discipline covering, on the scale of atomic time, a span between 10–⁴⁴ seconds (Planck time) and 10¹⁰⁰ years (the time after which a supermassive black hole of galaxy mass will have been radiated away through the Hawking process) seems called for also from the point of view of physics¹. In cosmology we encounter a field of research well established by all social criteria, a common endeavor of mathematics, theoretical physics, astronomy, astrophysics, nuclear and elementary particle physics claiming to explain more than the cosmogonic myths of the days of old. Has cosmology become a natural science, even a branch of the exact sciences?