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The Dark Energy Spectroscopic Instrument has completed the largest 3D map of the universe ever made, cataloging 47 million galaxies and quasars across 11 billion years of cosmic history. Its measurements deepen the "Hubble tension" — a persistent 5.8-sigma discrepancy between local and early-universe determinations of how fast the cosmos is expanding — while adding 4.2-sigma evidence that dark energy itself may be changing over time, a finding that could upend the standard model of cosmology.