What we know about dark matter

Very recommendable! A concise summary/overview! "In short, dark matter is still pretty mysterious. "

'Dark matter formed very early on in the universe’s history. The evidence of this is apparent in the cosmic microwave background, or CMB ... The fact that so much dark matter still seems to be around some 13.7 billion years later ... we can say that it accounts for 85% of the known matter in the universe."

What we know about dark matter | symmetry magazine: Although scientists have yet to find the spooky stuff, they aren’t completely in the dark.