Portal:Mathematics/Featured picture/2007 09
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Picture of the month
![](http://upload.wikimedia.org/wikipedia/commons/thumb/9/98/End_of_universe.jpg/360px-End_of_universe.jpg)
Credit: NASA
A triangle in three different geometries. The top is a spherical triangle in spherical geometry, the middle shows a hyperbolic triangle in hyperbolic geometry and the bottom is a triangle in Euclidean geometry.
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