Recent breakthroughs in cosmology pose questions that require particle
physics answers. I review the problems of dark matter, baryogenesis, and dark
energy and discuss how particle colliders, particularly the International
Linear Collider, may advance our understanding of the contents and evolution of
the Universe.Comment: 18 pages, Plenary Colloquium presented at the 2005 International
Linear Collider Workshop, Stanford, California, USA, 18-22 March 200
