Various measurements for components of Omega:
Omega(nu) ~ (m/20 eV) (massive)
Note that all of the measurements for Omega ===> Omega > 0.1 - 0.3 while the luminous galaxy part of Omega ~ 0.007 ===> that > 90 % of the Universe must be dark (non-luminous), i.e., > 90 % of the Universe is dark matter. Further, if the Big Bang constraint is to be believed, then this dark matter must be exotic material in the sense that baryons (protons, neutrons) are the normal stuff we mess around with.