The basic characteristics of the LSST facility derives directly from its science programs. The telescope itself must have a wide field of view in order to obtain several hundred images of each area of the sky over an entire hemisphere in only 10 years. The aperture must be large in order to achieve the sensitivity required to reach faint limiting magnitudes. The wavelength coverage must be broad in order to derive photometric redshifts and to characterize the ages and metallicities of stellar populations.
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