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== Shape ==
== Shape ==
The common view among [[cosmology|cosmologists]] is that the universe comprises more than the three dimensions that we see, and that the universe is expanding in another dimension.
The common view among [[cosmology|cosmologists]] is that the universe is a four dimensional Riemannian [[manifold]] whose spatial part of the metric is increasing over time. This is interpreted as an expansion of the universe.
Imagine you are at a random spot on a spotted [[balloon]], when someone inflates the balloon you'll see the spots moving away from you, so it would seem you are at the center of the expansion.
Imagine you are at a random spot on a spotted [[balloon]], when someone inflates the balloon you'll see the spots moving away from you, so it would seem you are at the center of the expansion.