Dark Matter
  The evidence for the dark matter of the hot big bang cosmology is about as
good as it gets in natural science. The exploration of its nature is now led by
direct and indirect detection experiments, to be complemented by advances in
the full range of cosmological tests, including judicious consideration of the
rich phenomenology of galaxies. The results may confirm ideas about DM already
under discussion. If we are lucky we also will be surprised once again.
