The first stars to form after the Big Bang and the Dark Era were very massive and played a leading role during the reionization epoch. From that moment onwards photons could travel unhindered in space, bringing us information about distant objects. The main difference between the first stars and those seen at present is that the former were formed solely from hydrogen and helium, in the absence of metals. Metal-poor massive stars are therefore fundamental to our understanding of the early stages of the Universe. New observations with the Gran Telescopio CANARIAS(GTC) take us a step closer to understanding stars in the early Universe. This work has been published in the journal Astronomy & Astrophysics.
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