  I briefly review some of the main scientific outputs expected from the
upcoming Planck mission. Planck will map the CMB sky with 5' resolution and
$\mu$K sensitivity, with minimal foreground contribution and superb control on
systematics. It will collect the entire information enclosed in the temperature
primary anisotropy signal and will also get a good measurement of the polarized
component of the CMB. This will have profound implications on our knowledge of
the physics of the early universe and on the determination of cosmological
parameters.

Astrophysics