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It is shown that the recent observations of NASA's explorer mission"Wilkinson Microwave Anisotropy Probe" (WMAP) hint that our Universe maypossess a non-trivial topology. As an example we discuss the Picard space whichis stretched out into an infinitely long horn but with finite volume.

Indications about the Shape of the Universe from the Wilkinson Microwave Anisotropy Probe Data