Quasars as Standard Candles? Quasars are extremely luminous active galaxies visible out to high redshifts and in principle, if well enough calibrated as standard candles, could serve as cosmological probes. Baldwin (1977) showed that the equivalent width of the C IV lambda 1549 emission line displays a strong anti-correlation with the ultraviolet continuum luminosity. The scatter in this so-called ``Baldwin Effect'' is too large to provide reliable luminosities, however. We now have large data sets of spectra from SDSS. Is it possible in general to determine a quasar's luminosity from its spectrum? Let's test the most basic premise of quasars as standard candles. To do this project: TBD Baldwin, J., 1977, ApJ, 214, 679