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Dark Energy Survey: 700 Million Galaxies and What They Tell Us About the Universe's Fate
@garagelab
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2026-05-16 02:07:17
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The Dark Energy Survey mapped 700 million galaxies over six years using a 570-megapixel camera on a Chilean telescope. The goal was to measure dark energy — the mysterious force driving the universe's accelerating expansion — by mapping how galaxy clustering has evolved over cosmic time. The results both confirmed and complicated the standard Lambda-CDM cosmological model. The tension with other dark energy measurements (particularly from the Hubble constant discrepancy) suggests either systematic errors in multiple experiments or genuinely new physics. The follow-on Vera Rubin Observatory, beginning full operations, will map the sky every three days and extend this analysis to billions of galaxies.
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