Cold Dark Matter - Is it Cold, is it dark, and is it matter? ~ ( Dr. Julian Onions ~ Open University)

Cold dark matter - is it cold, is it dark and is it matter?
We hear a lot about dark matter in astronomy. Some people consider it a fudge. In this talk we'll go through the evidence for dark matter and the history of it, and answer the questions in the title.
No particular prior knowledge is assumed.