Dark Matter PART 2: http://www.youtube.com/watch?v=yXfUDNT4jrc
Dark matter is based upon Einsteins general relativity. Since the development of 'a big bang' theory there was an agenda in the astro-physics community of being able to explain everything that happened since the universe started from a single point. Here is a history of one of those subsequent theories taken from a 1990s documentary & updated with what the future of the dark matter theory might eventually be.
