E-Mail IMAGE: Image of the studied galaxy cluster in formation, 12.5 billion light years from us. The circles indicate the new members discovered with the GTC, 4 of them are shown in... view more Credit: Credit: NASA/ESA/GOODS-N+3DHST+CANDELS Team/Daniel López/IAC A study, led by researchers at the Instituto de Astrofísica de Canarias (IAC) and carried out with OSIRIS, an instrument on the Gran Telescopio Canarias (GTC), has found the most densely populated galaxy cluster in formation in the primitive universe. The researchers predict that this structure, which is at a distance of 12.5 billion light years from us, will have evolved becoming a cluster similar to that of Virgo, a neighbour of the Local Group of galaxies to which the Milky Way belongs. The study is published in the specialized journal