title: Dark matter.
abstract: The evidence for the dark matter (DM) 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.
authors.affiliation: Joseph Henry Laboratories, Princeton University, Princeton, NJ 08544 pjep@princeton.edu.
authors.forename: P James E
authors.initials: PJ
authors.lastname: Peebles
keywords: cosmic structure; dark energy