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Published online by Cambridge University Press: 17 July 2013
The formation of the first galaxies marks the end of the cosmic dark ages, initiating the prolonged process of reionization and enriching the pristine intergalactic medium with the first heavy chemical elements. It is now possible to simulate this process with ever greater detail of physical realism, while still considering the proper cosmological context. The simulations have taught us that the feedback from Population III stars is vital in shaping the properties of early galaxies. We are close in pushing ab initio simulations to the point where future instruments, such as the James Webb Space Telescope, can directly test theoretical predictions.