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→Problems for evolutionary theory
== Problems for evolutionary theory ==
== Problems for evolutionary theory ==
Pluto was initially supposed to have been a [[moon]] of [[Neptune]]. But with the discovery of [[Charon]] in 1978, and the subsequent discoveries of its other moons [[Hydra]] and [[Nix]], that theory became far less plausible.
Pluto was initially supposed to have been a [[moon]] of [[Neptune]]. But with the discovery of [[Charon]] in 1978, and the subsequent discoveries of its other moons [[Hydra (moon)|Hydra]] and [[Nix]], that theory became far less plausible.
Another hypothesis has held that Pluto entered the [[solar system]] from outside, and the [[Sun]] captured it. But if such a mass dived into the solar system from outside, then it would have followed a hyperbolic path. That it did not pass back ''out'' of the solar system to complete the hyperbola begs explanation.
Another hypothesis has held that Pluto entered the [[solar system]] from outside, and the [[Sun]] captured it. But if such a mass dived into the solar system from outside, then it would have followed a hyperbolic path. That it did not pass back ''out'' of the solar system to complete the hyperbola begs explanation.