[spunkets]

" Contraction theory (to explain mountains) for one. Since replaced by the Theory of Plate Tectonics.
The Kelvin Helmholtz's Contraction Theory to expain the sun's energy for two --

Neither one was ever any more than a hypothesis. There may have been some evidence where a stretch might be made to call it a weak theory. In both cases, the hypothesis didn't pan out. The same for Lamarkian evolution.

[USFRIENDINVICTORIA]

"Neither one was ever any more than a hypothesis."

Semantics.