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This paper, http://arxiv.org/abs/1312.5320, discusses the possible detection of galaxies almost entirely consisting of pop III stars.
Pop III stars are the first generation of stars that formed in the early universe, composed of only hydrogen, helium, and trace amounts of lithium.
Pop III stars were detected through observations of their remnants, such as supernova explosions and cosmic microwave background radiation.
The detection of Pop III stars provides insight into the early universe and the conditions that led to the formation of galaxies and the elements necessary for life.
Pop III stars are different from other stars because they have a distinct composition and are found in the early universe, making their detection more challenging.
The first detection of Pop III stars has implications for our understanding of the formation and evolution of the universe, as well as the potential for discovering new types of stars and astronomical objects.