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Cosmic variance
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== Similar problems == A similar problem is faced by [[evolutionary biology|evolutionary biologists]]. Just as cosmologists have a [[statistical sample|sample size]] of one universe, biologists have a sample size of one fossil record. The problem is closely related to the [[anthropic principle]]. Another problem of limited sample sizes in astronomy, here practical rather than essential, is in the [[Titius–Bode law]] on spacing of satellites in an orbital system. Originally observed for the Solar System, the difficulty in observing other solar systems has limited data to test this.
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