It's not the existence of these phenomena that's unexplained, but specific observations that don't fit our current theories. This article seems like a decent i

It's not the existence of these phenomena that's unexplained, but specific observations that don't fit our current theories. This article seems like a decent introduction: https://medium.com/starts-with-a-bang/five-reasons-we-think-dark-matter-exists-a122bd606ba8 https://medium.com/starts-with-a-bang/five-reasons-we-think-...