Astr 204 November 15, 2001 

Mass to light ratio?

Lots of dark matter?

Mass/light of Milky Way

Galaxy halos

Second and third way

Galaxy clusters

Deviations from Hubble flow

Kepler's and Newton's laws

Which do you prefer?

What about gas and dust?

Dark matter candidates

MACHO's

Gravitational lensing events

WIMPs

Neutrinos

Neutrinos not dark matter