  This paper reviews some of the results of the Planck collaboration and shows
how to compute the distance from the surface of last scattering, the distance
from the farthest object that will ever be observed, and the maximum radius of
a density fluctuation in the plasma of the CMB. It then explains how these
distances together with well-known astronomical facts imply that space is flat
or nearly flat and that dark energy is 69% of the energy of the universe.
