A new theory,
https://en.wikipedia.org/wiki/Scientific_theory
A scientific theory is an explanation of an aspect of the natural world and universe that can be (or a fortiori, that has been) repeatedly tested and corroborated in accordance with the scientific method, using accepted protocols of observation, measurement, and evaluation of results. Where possible, theories are tested under controlled conditions in an experiment.[1][2] In circumstances not amenable to experimental testing, theories are evaluated through principles of abductive reasoning. Established scientific theories have withstood rigorous scrutiny and embody scientific knowledge.
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The meaning of the term scientific theory (often contracted to theory for brevity) as used in the disciplines of science is significantly different from the common vernacular usage of theory.[5][note 1] In everyday speech, theory can imply an explanation that represents an unsubstantiated and speculative guess,[5] whereas in a scientific context it most often refers to an explanation that has already been tested and is widely accepted as valid.[1][2]
Despite the godless God-complex of modern scientists, all theories are wrong; a very small number are useful, sometimes. Like models, all theories are reductions, meant to put a usable handle on real world things our 3 pound brains can grasp. Scientific theories are tools that work well in some situations, and not at all in others. It doesn't take much digging to find holes, if not outright jerry-rigging, in any scientific theory.