Solutions to the Missing Mass Question, I haven't stay current with this for several years - anything new?

Answer 1

the composition of dark matter is unknown. it may be as much as four percent ordinary matter, but the rest is unknown. there is about six times as much dark matter than ordinary matter. dark matter interacts with ordinary matter only thru gravitation. fritz zwicky discovered it in 1933.

read this:
http://en.wikipedia.org/wiki/Dark_matter