I mean, define “scientific”. A currently-held, consensus theory? Because it’s easy to find theories that were developed in accordance with scientific theory, held for a while, but discarded.
In physics, aether theories (also known as ether theories) propose the existence of a medium, a space-filling substance or field as a transmission medium for the propagation of electromagnetic or gravitational forces. “Since the development of special relativity, theories using a substantial aether fell out of use in modern physics, and are now replaced by more abstract models.”