GOODS: Great Observatories Origins Deep Survey Galaxies at High Redshift Theory predicts that dark matter structures form at z~20-30 It does not clearly predict galaxies, because we do not fully understand star formation We need to push empirical studies of galaxy evolution to the highest redshifts We collected the deepest and largest quality samples of galaxies at z~4 through ~6 B 435 V 606 z 850 Unattenuated Spectrum Spectrum Attenuated by IGM B 435 V 606 i 775 z 850 Z~4
{}