  A cosmological model is introduced in which dark matter plays a dominant role
throughout the history of the universe, and is the only matter present for
temperatures $T \gtrsim T_{15} \sim 10^9$ GeV. The gauge group is $SU(3) \times
SU(6)_{DM} \times U(1)_Y$ and unifies in such a way that luminous matter is
generated at $T \sim T_{15}$ with the correct amount and eventual asymmetry.
Construction of more highly sensitive direct detectors of dark matter (e.g.
XENON1T) is encouraged. We offer a new explanation of why grand unification
theories involving only luminous matter may be fatally flawed.
