  Over the past three years we have determined the basic features of our
Universe. It is spatially flat; accelerating; comprised of 1/3 a new form of
matter, 2/3 a new form of energy, with some ordinary matter and a dash of
massive neutrinos; and it apparently began from a great burst of expansion
(inflation) during which quantum noise was stretched to astrophysical size
seeding cosmic structure. This ``New Cosmology'' greatly extends the highly
successful hot big-bang model. Now we have to make sense of it. What is the
dark matter particle? What is the nature of the dark energy? Why this mixture?
How did the matter -- antimatter asymmetry arise? What is the underlying cause
of inflation (if it indeed occurred)?
