Through cosmology and particle physics we review our understanding of how our universe came into existence. Of particular interest is what makes up dark matter the source of all structure formation. Direct detection experiments such as CDMS search directly for dark matter particles passing through the laboratory, indirect detection experiments such as GLAST/Fermi look for gamma rays from dark matter particle-antiparticle annihilations, and accelerators such as the LHC at CERN may soon provide direct evidence for the structure of particle physics in dark matter sector.