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A recent study, led by the Centre for Astrobiology (CAB, CSIC-INTA) with participation by the Instituto de Astrofísica de Canarias (IAC) presents the first extensive sample of massive stars whose chemical composition shows a lower metal content than that of the Small Magellanic Cloud. This is a basic first step in performing an exhaustive characterization of the properties of massive stars with low metallicity. Massive stars with very low metallicity are important for interpreting the processes which took place in the early phases of the univers, such as reionization and early chemical
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