  [A brief review intended for a general physics colloquium audience.]
Astrophysicists now know that 80% of the matter in the universe is `dark
matter', composed of neutral and weakly interacting elementary particles that
are not part of the Standard Model of particle physics. I will summarize the
evidence for dark matter. I will explain why I expect dark matter particles to
be produced at the CERN LHC. We will then need to characterize the new weakly
interacting particles and demonstrate that they are the same particles that are
found in the cosmos. I will describe how this might be done.
