"Astronomers have released the most ambitious cosmic map assembled so far, confirming that matter in the Universe is less clumpy than standard cosmological theory would predict. From 2013 to 2019, the Dark Energy Survey (DES) team repeatedly imaged a large section of Earth's southern sky to collect the positions, colours and shapes of around 150 million galaxies."
"The team analysed four different aspects of the data: the brightness and other characteristics of the supernovae; the clustering of galaxies across space and time; the evolving size of remnants of pressure waves generated in the Universe's infancy; and the distortion of images of background galaxies by large concentrations of intervening invisible dark matter'."
"The combined results refine previous DES measurements to confirm that gravity has not clumped galaxies together as much as as much as observations of the early Universe would lead us to anticipate, were the standard theory of the Universe's evolution correct an ongoing puzzle for cosmologists."
From 2013 to 2019 the Dark Energy Survey repeatedly imaged a large portion of the southern sky, collecting positions, colours and shapes of roughly 150 million galaxies and observing over 1,500 type‑Ia supernovae. Measurements combined supernova brightness, galaxy clustering, baryon acoustic oscillation scales and weak gravitational lensing. The six-year combined results indicate that large-scale structure growth is weaker than predicted by the standard cosmological model based on early‑Universe observations. The refined DES measurements therefore maintain an unresolved discrepancy between late-time structure and standard-model expectations.
Read at www.scientificamerican.com
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