“In considerations involving the nature of the world as a whole the irregularities caused by the aggregation of matter into stars and stellar systems may be ignored; and if we further assume that the total matter in the world has but little effect on its macroscopic properties, we may consider them as being determined by the solution of an empty world.”

—  Howard P. Robertson

"On Relativistic Cosmology" (1928)

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Howard P. Robertson28
American mathematician and physicist 1903–1961

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