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Recent deep near-infrared studies demonstrate that galaxies at redshifts z>2 form a much more diverse population than previously thought. In particular, many galaxies have such red optical - infrared colors that they cannot be detected in deep optical surveys. These Distant Red Galaxies, or DRGs, may dominate the stellar mass budget at high redshift, and could also contribute substantially to the cosmic star formation rate at z~2.5. These massive red galaxies are probably the progenitors of today's elliptical and S0 galaxies. |