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flat universe comparison table
Subject has definition has synonym is a kind of has geometry of space
big bangOne of three standard Big Bang models that were formulated by Friedmann and Lemaitre of an isotropic and homogeneous universe composed of expanding matter and radiation. In these models space is unbounded.Friedmann-Lemaitre universecosmology theory 
flat universeA world model of a static universe with a positive cosmological constant, whose radius of curvature is constant and independent of time.Einstein-de Sitter universebig bangflat or Euclidian

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