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Until now, investigating the early stages of galaxy formation has beenprimarily the realm of theoretical modeling and computer simulations, whichrequire many physical ingredients and are challenging to test observationally.However, the latest Hubble Space Telescope observations in the near infraredare shedding new light on the properties of galaxies within the first billionyears after the Big Bang, including our recent discovery of the most distantproto-cluster of galaxies at redshift z~8. Here, I compare predictions frommodels of primordial and metal-enriched star formation during the dark ageswith the latest Hubble observations of galaxies during the epoch ofreionization. I focus in particular on the luminosity function and on galaxyclustering as measured from our Hubble Space Telescope Brightest of ReionizingGalaxies (BoRG) survey. BoRG has the largest area coverage to find luminous andrare z~8 sources that are among the first galaxies to have formed in theUniverse.

The Brightest of Reionizing Galaxies (BoRG) survey