Newton thought he had it "pretty well down pat." Who knows what we will learn in the future that we are not quite right about now? Being a scientist means never being able to say "we have it pretty well down pat." (In the 18th century there was a move afoot to close the patent office because "everything useful has already been invented." and at the opening of the 20th century physics was just a matter of "coaxing out a few more decimal points" in the values of the natural constants. Everything important having already been discovered.
In the present case the "evidence" is gravitational anomalies.note The assumption, completely unwarranted IMHO, is that some kind of invisible matter is the cause. There's a giant leap between observing an effect and hypothesizing a cause for that effect. Especially an invisible, undetectable cause.
I love science. I trust science. I believe in science. My degrees are in Math and engineering, so I used science every day in my work before I retired. But I also think ideas should must be challenged. I enjoy, as a mental exercise, trying to poke holes in things like the big bang, dark matter, string theory, and other highly speculative branches of physics.
[font size=1]Note: Actually, it's not even gravitational anomalies. It's motion anomalies. Those anomalies might not even be caused by gravity. They might even be caused by magnetic or electrostatic forces. We can speculate, and hypothesize, but at the distances involved, we simply cannot know for certain.[/font]
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