Why does gravity have the strength it has? What exactly determines the value of the electromagnetic force? Are the laws of Physics the same in any part of the universe and at any instant in time? Measurements made with the ESPRESSO high resolution spectrograph on the Very Large Telescope (VLT) have permitted the determination of one of the fundamental constants of Physics when the universe was only 40% of its present age, helping to find an answer to one of these questions. The study, in which a leading group of researchers from the Instituto de Astrofísica de Canarias (IAC) participated, is
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