Conclusions Cosmology is in a "golden age" due to large amounts of high quality observational data much of which is "simple" to interpret. LCDM model seems solid: Consistent with available data Parameters measured to high precision However, very far from complete: What is the dark matter? What is the nature of the dark energy? Is it a simple vacuum energy or something more complex? How were the initial conditions set? Did inflation occur? Is the expansion really accelerating???