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flat universe comparison table

Subject	has definition	has synonym	is a kind of	has geometry of space
big bang	One 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 universe	cosmology theory
flat universe	A world model of a static universe with a positive cosmological constant, whose radius of curvature is constant and independent of time.	Einstein-de Sitter universe	big bang	flat or Euclidian

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