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25 de abril de 2024
lentes de sol a full
Descubren la galaxia más luminosa del Universo jueves 18 de junio de 2015 09:51
Un grupo internacional de astrónomos descubrió la galaxia CR7, la más brillante y luminosa del universo, que muestra incluso señales de las primeras estrellas formadas tras el Big Bang, anunció la Universidad de Lisboa. Llamada CR7 en alusión al "astro" del fútbol portugués Cristiano Ronaldo, aunque en realidad es la abreviatura de COSMOS Redshift 7, es tres veces más brillante de la que ostentaba el récord hasta ahora, la galaxia Himiko, a 13.000 millones de años luz de la tierra, según el comunicado difundido por la Universidad. "Decidimos seguir un camino totalmente diferente del resto del mundo, e hicimos un mapa de grandes áreas del cielo. Sabíamos que el riesgo de buscar donde nadie busca podía ser fácilmente compensado por descubrimientos inesperados", dijo el líder del grupo de astrónomos, el luso David Sobral. Además de la galaxia más luminosa, los astrónomos hicieron otro gran descubrimiento, considerado por Sobral como "el Santo Grial de la astronomía", el de las primeras estrellas formadas en el Universo. En la CR7 hallaron grandes emisiones de helio e hidrógeno ionizados sin ninguna señal de elementos pesados, lo que les llevó a ese segundo hallazgo, que Sobral calificó de significativo porque "fueron esas estrellas las que permitieron nuestro existencia" y las que crearon los elementos esenciales para la formación del Sol y la vida en el Universo.. Ese conjunto de estrellas, tradicionalmente llamado "Población III", no habían sido halladas nunca y solo se conocía su existencia a nivel teórico.