All articles tagged with #desi
The Dark Energy Spectroscopic Instrument (DESI) completed the most detailed cosmic survey to date, mapping more than 47 million galaxies and quasars across about 14,000 square degrees to create a 3D map of the universe. The dataset aims to test whether dark energy evolves over time and will be analyzed further before broader public access, with future observations planned to extend the coverage and duration into the 2030s.
April’s best science images span cosmic to terrestrial: the DESI project delivers the most detailed 3D map of the universe from 47 million galaxies and quasars, accompanied by Earth-bound highlights such as climate-threatened cherry blossoms in Japan, the discovery of a new endangered Liopholis mutawintji skink in Australia, a lab-grown dinosaur-collagen leather bag, insights into limb regeneration, advanced 3D imaging of coral skeletons with deep learning, and NASA’s Artemis II Moon fly-by with Space Launch System boosters.
DESI finished its first official survey, delivering the largest high‑resolution 3D map of the cosmos—47 million galaxies and 20 million stars across 11 billion years—unlocking a data trove that could test the constant nature of dark energy (lambda) and reveal potential evolution. While previous hints suggested possible tensions with the standard model, scientists emphasize careful error analysis and independent confirmation. With six data‑heavy paper batches planned and follow‑on surveys like Euclid and Rubin Observatory on the horizon, the DESI results are likely to refine or challenge current cosmology rather than settle it outright.
The Dark Energy Spectroscopic Instrument (DESI) at Kitt Peak National Observatory has produced the largest 3D map of the universe, charting about 47 million galaxies and more than 20 million Milky Way stars over a five-year survey. The map uncovers the cosmic web of filaments and voids and enables researchers to track how dark energy has shaped the universe’s expansion over the last 11 billion years, with DESI continuing observations through 2028 to expand the dataset and first full results anticipated in 2027.
The Dark Energy Spectroscopic Instrument (DESI) has produced the largest high‑resolution 3D map of the universe, cataloging about 47 million galaxies (and more than 20 million nearby stars) into a cosmic web of filaments and voids. By mapping galaxy positions over roughly 11 billion years, scientists aim to understand how dark energy shapes cosmic expansion; DESI will continue observations through 2028 to expand the map by ~20%, with first full dataset results expected in 2027.
The Dark Energy Spectroscopic Instrument (DESI) has produced the universe’s largest 3D map, cataloging 47 million galaxies and quasars—well above its target—across five years. Published in Astronomy & Astrophysics, the data could prompt a major shift in cosmology, with early results suggesting dark energy may not be constant and could be weakening the universe’s acceleration, challenging the standard LCDM model.
Scientists using the Dark Energy Spectroscopic Instrument (DESI) have unveiled the most detailed 3D map of the universe, cataloging more than 47 million galaxies (and 20 million stars) with a 5,000-fiber system at Kitt Peak. The map reveals the cosmos’s structure and traces light back over 11 billion years, helping to study dark energy; first dark-energy results from the five-year data are expected in 2027, with plans to expand the survey to roughly 17,000 square degrees in coming years. The effort involved 900 scientists from 70 institutions.
Astronomers using the Dark Energy Spectroscopic Instrument (DESI) have completed the largest high‑resolution 3D map of the universe, mapping more than 47 million galaxies. The dataset could sharpen our understanding of dark energy and the cosmic expansion, potentially testing whether dark energy is the cosmological constant, with about 20% more sky to be added by 2028 and definitive dark‑energy results expected in 2027.
DESI has produced the largest 3D map of the universe, showing Earth at the center with every light point representing a galaxy, a spectacular visualization scientists will use to study dark energy and the cosmos.
DESI finished its originally planned five-year survey ahead of schedule, delivering the largest high-resolution 3D map of the universe by observing more than 47 million galaxies and quasars and 20 million nearby stars. The endeavor will extend the map to about 17,000 square degrees by 2028 to improve studies of dark energy and dark matter, with first full five-year results expected in 2027. The effort overcame challenges from COVID-19, the 2022 Kitt Peak fire, and weather, and will continue processing the data and expanding observations to new galaxy populations as DESI pushes deeper into cosmic history.
DESI finished its five-year survey, delivering the largest-ever 3D map of the cosmos (about 47 million galaxies/quasars and 20 million stars). Early analyses suggest dark energy may be weakening, a finding that could challenge the Lambda-CDM cosmology and signal a major shift in our understanding of the universe; further data from the full map are expected.
DESI has completed its five-year survey, delivering the largest high-resolution 3D map of the universe that spans over 11 billion years of cosmic history and catalogs more than 47 million galaxies and quasars plus 20 million stars, a milestone for studying dark energy with data analysis ongoing through 2028.
A new paper by Slava Turyshev argues that small systematic biases in how we measure supernova brightness and the standard ruler set by baryon acoustic oscillations could explain the DESI DR2–CMB mismatch, potentially removing the case for evolving dark energy. He also advocates the Alcock-Paczynski diagnostic to reduce dependence on early-universe benchmarks and outlines scenarios like the Late-Transition Interacting Thawer (LTIT) and Phantom Crossing as alternative explanations, with upcoming data from Euclid expected to test these ideas.
A new preprint suggests empty space behaves like a viscous fluid with bulk viscosity that resists expansion, introducing a time-varying drag on cosmic expansion to address DESI measurements. If future data from galaxy surveys, supernovae, and lensing align with this drag pattern, the idea could challenge the idea of a constant dark-energy driver, potentially replacing it with a dynamic picture—but the proposal remains speculative and requires peer review and broader observational checks.
New measurements from the Dark Energy Survey (DES) and DESI suggest the cosmological constant may be negative, causing the universe to keep expanding for about 11 billion more years before contracting to a Big Crunch roughly 20 billion years from now, for an approximate total lifespan of 33 billion years. The scenario relies on evolving dark energy, potentially linked to a very light particle, and is consistent with observations from DES and DESI, with future surveys like Euclid, SPHEREx, and Rubin Observatory planned to test the idea.