> Of course, there's a counter-example in the inner solar system in the form of Vulcan. It was invented to explain Mercury's orbit, but the solution ended up be

> Of course, there's a counter-example in the inner solar system in the form of Vulcan. It was invented to explain Mercury's orbit, but the solution ended up being Relativity. So it's not always the right answer. If anything, the Vulcan hypothesis was not bold enough. It was a much greater leap of faith to assume that Newton's mechanics was just a low energy approximation, hence the twist in Mercury's orbit. Anyway, we don't really know what this whole dark matter business is, but for now the prevailing hypothesis is the dark-matter-as-a-new-type-of-particle. Of course, you're welcome to pursue a different line of thought, and let the truest hypothesis win. This is how science works.