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# Shape of Universe summary page for inclusion in others

## Shape of the Universe

Is the Universe finite or infinite (video)? Scientific models of the Universe are intended to satisfy the Einstein equation, which, roughly speaking, states that curvature = density and that *mass density curves space*. The models allow many different sorts of spaces, which have the local property called a **metric** (a sort of rule for locally measuring distances, that determines **curvature**) and have global properties that define them, such as **topology**. Global topology can be measured by multiple imaging or by topological acceleration. Together curvature and topology can be described as **shape**. The metric of the standard Universe model has many parameters such as the Hubble parameter, the baryon density parameter, the baryonic and non-baryonic dark matter density parameter , and the dark energy parameter . This standard model is oversimplified: it assumes that for the chosen separation of spacetime into space and time coordinates, the Universe is the same everywhere (**homogeneous**) in space at a given time coordinate.
-- BoudRoukema - 05 Nov 2015

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Topic revision: r4 - 11 Jan 2024, BoudRoukema

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