> Dark matter and Dark Energy are just a very clever way of saying "we have no idea what's going on with gravity in the large scale (beyond solar system scales)

> Dark matter and Dark Energy are just a very clever way of saying "we have no idea what's going on with gravity in the large scale (beyond solar system scales)". While I agree with definition of dark matter that you provided, keep in mind that there are hypothesis that try and explain it as something that exists. For example: WIMPs.