The proposed Large Synoptic Survey Telescope (LSST) will observe
the entire sky visible from Cerro Pachon in northern Chile once
every four nights with broad-band optical imaging. The accumulated
ten-year data set will reach depths of 27 AB magnitude in each of
six bands, and will produce a catalog of over four billion
galaxies. A quarter of a million Type 1a supernovae will be
detected per year. The LSST design and construction plans will be
presented, and the potential for precision studies of cosmology,
dark matter, and dark energy will be discussed.