![GTC/OSIRIS spectrum of BG1429+1202 showing strong Lyman-Alpha emission as well as strong absorptions from its interstellar medium and stellar winds. In insets panels, DECaLS grz color image, GTC g-band, and WHT i-band of BG1429+1202 are shown. GTC/OSIRIS spectrum of BG1429+1202 showing strong Lyman-Alpha emission as well as strong absorptions from its interstellar medium and stellar winds. In insets panels, DECaLS grz color image, GTC g-band, and WHT i-band of BG1429+1202 are shown.](/sites/default/files/styles/crop_square_2_2_to_320px/public/images/news/resultados184_200.jpg?itok=Q7R0e7EY)
In the phenomenon of gravitational lensing, predicted by Einstein's General Theory of Relativity, the mass of a galaxy acts on the light of a more distant object, as if it were a huge lens, producing a distorted image with the form of a so-called Einstein ring or multiple images and a magnification of the total flux, allowing to see details which would otherwise be too faint to detect. GTC/OSIRIS spectroscopic observations allowed to discover one of the brightest galaxies in the early Universe, BG1429+1202, located at a redshift of 2.82 (we see it as it was some 2,300 million years after the
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