[ajkjk]

It is heavily verified by experimental evidence, and has been since it was first proposed. That's why people have spent so much time studying it. It's not like it was just a random hair-brained idea someone had.

The only thing we haven't done is figured out what it is in terms of other concepts we know, such as elementary particles.

[dbsmith83]

Sure, the anomolous observations are verified, but there is no experiment that has been conducted to directly detect it as far as I know. What you said about what we don't know is precisely my point. Given that this article mentions the discrepancy between models and observations, I'd say we know hardly much at all about it--whatever it may be given that we can't directly detect it and we can't even make a good model to predict its behavior