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New catalogue reveals major gap in knowledge about the most extreme objects in the Universe

Using data from the Fermi Gamma-ray Space Telescope, collected over 16 years, a team led by a researcher from the Instituto de Astrofísica e Ciências do Espaço has revealed that we do not know the distance to most of the highest-energy cosmic sources ever detected — a fact that has significant implications for our understanding of the most extreme phenomena in the Universe. Read more

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