If you think a galaxy is big, compare it to the size of the universe: it's just a tiny dot which, together with a huge number of other tiny
"If you think a galaxy is big, compare it to the size of the universe: it's just a tiny dot which, together with a huge number of other tiny dots, forms clusters that aggregate into superclusters, which in turn weave into filaments threaded with voids—an immense 3D skeleton of our universe."
(Two 'fans' corresponding to the two main areas DESI has observed, above and below the plane of our Milky Way (see this map). DESI is mounted on the U.S. National Science Foundation Nicholas U. Mayall 4-meter Telescope at Kitt Peak National Observatory (KPNO), a Program of NSF NOIRLab. DESI has made the largest 3D map of our universe to date and uses it to study dark energy. Earth is at the center of the two fans, where bluer points indicate more distant objects. This is a still from an animated rotation of the DESI Year-3 data map. Credit: DESI Collaboration/DOE/KPNO/NOIRLab/NSF/AURA/R. Proctor)
"If that gives you vertigo and you're wondering how one can understand or even "see" something so vast, the answer is: it isn't easy. Scientists combine the physics of the universe with data from astronomical instruments and build theoretical models, such as EFTofLSS (Effective Field Theory of Large-Scale Structure). Fed with observations, these models describe the "cosmic web" statistically and allow its key parameters to be estimated."
"An international team including, among others, INAF (Italy), The University of Parma (Italy) and the University of Waterloo (Canada) has published in the Journal of Cosmology and Astroparticle Physics a study testing the emulator Effort.jl, which they designed. The study is titled "Effort.jl: a fast and differentiable emulator for the Effective Field Theory of the Large Scale Structure of the Universe.""
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