Tag

Desi

All articles tagged with #desi

space12 days ago•134 min saved

Cosmic atlas maps 4 billion objects in the largest 2D sky survey

An international team released the largest 2D map of the universe, charting about 4 billion objects across three-quarters of the sky, using 13 years of data from the DESI Legacy Imaging Surveys and observations from the Dark Energy Camera (Blanco 4m), Mayall 4m, and Bok 2.3m telescopes, with data supplemented by WISE. The high‑resolution map spans visible and near‑infrared light and will guide future observatories, helping researchers find gravitational lenses, supernovae and dark‑matter/dark‑energy phenomena while informing projects like the Vera C. Rubin Observatory and the Nancy Grace Roman Space Telescope.

via Live Science|

#astronomy #cosmic-map #cosmology

space13 days ago•158 min saved

Cosmic Atlas: 5.6-Trillion-Pixel Map Reveals 4 Billion Objects Across Most of the Sky

Astronomers using the DESI Legacy Imaging Surveys have released the largest 2D map of the universe to date — a 5.6‑trillion‑pixel panorama spanning roughly three‑quarters of the sky and detailing nearly four billion celestial objects. Built from more than 263,000 telescope exposures over a decade and covering visible to near‑infrared wavelengths, the map provides the 2D foundation for DESI’s much larger 3D cosmic map and will aid dark‑energy studies, galaxy evolution research, and training AI systems for future observatories.

via Space|

#astronomy #cosmology #dark-energy

science1 month ago•16 min saved

Cosmic Isotropy Remains Intact as DESI Anomaly Fades with Proper Corrections

A claimed anisotropy in the DESI galaxy survey is shown to be an artifact from not accounting for redshift-space distortions. When comoving distances are used and distortions corrected, the data align with a homogeneous, isotropic universe, reaffirming the cosmological principle and the standard model of cosmology.

via Big Think|

#cosmology #desi #isotropy

science1 month ago•11 min saved

DESI data hint the cosmos isn't uniform at the largest scales

New DESI-based analysis finds directional patterns in the galaxy distribution that persist across billions of light-years, suggesting the universe may not be perfectly uniform on the largest scales. If confirmed, this challenges the cosmological principle and could force revisions to the standard Lambda-CDM model, including possibilities of more complex dark-matter interactions or larger-scale inhomogeneities. The observed patterns are stronger than those produced by simulations, underscoring the need for further data from DESI, Euclid and other surveys to verify the result and guide new theories of cosmic structure.

via The Conversation|

#cosmological-principle #cosmology #dark-matter

science2 months ago•4 min saved

Gigantic Cosmic Structures Challenge Isotropy at Grand Scales

New DESI data analysis finds galaxy distributions forming structures that extend to gigaparsec scales, appearing larger and more coherent than predicted by the standard Lambda-CDM cosmology and indicating persistent directional patterns. While this suggests a potential gap between theory and observation, scientists say there’s no agreed modification to ΛCDM yet; upcoming DESI releases and future surveys from Euclid and the Vera C. Rubin Observatory will help test these surprising findings.

via 404 Media|

#anisotropy #cosmology #desi

space-and-spaceflight2 months ago•17 min saved

Cosmic Acceleration Stands Firm Amid End-of-Universe Debates

A new MNRAS analysis reinforces that the universe’s expansion is still accelerating, countering a recent paper that argued measurement biases could mimic deceleration; after recalibrating for stellar ages, host-galaxy mass, and environmental factors, the results remain consistent with ongoing cosmic acceleration, underscoring the Big Freeze fate while highlighting ongoing scientific scrutiny of dark energy.

via Gizmodo|

#cosmic-acceleration #cosmology #dark-energy

space3 months ago•6 min saved

Five-Year Sky Survey Maps 47 Million Galaxies to Probe Dark Energy

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.

via The Daily Galaxy|

#astronomy #cosmology #dark-energy

science3 months ago•5 min saved

April’s science images spotlight a detailed 3D map of the universe and other breakthroughs

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.

via Nature|

#biodiversity #climate-change #desi

space4 months ago•5 min saved

Largest 3D Map of the Universe Deepens Cosmology Puzzle

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.

via Gizmodo|

#cosmology #dark-energy #desi

science4 months ago•37 min saved

Desi's 47 Million Galaxy Map Reveals the Cosmic Web and Dark Energy’s History

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.

via Yahoo|

#cosmic-web #dark-energy #desi

space4 months ago•62 min saved

DESI's 3D Universe Map Charts 47 Million Galaxies to Probe Dark Energy

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.

via Live Science|

#cosmology #dark-energy #desi

science4 months ago•6 min saved

Cosmic Census Reaches New Depths: DESI Unveils the Largest 3D Map, Hinting Dark Energy Might Evolve

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.

via The Daily Galaxy|

#3d-map #cosmology #dark-energy

science4 months ago•39 min saved

Cosmic CT Scan Maps 47 Million Galaxies in Unprecedented 3D Atlas

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.

via Daily Mail|

#astronomy #cosmology #dark-energy

science4 months ago•34 min saved

Cosmic atlas reveals 47 million galaxies to probe dark energy

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.

via Yahoo|

#berkeley-lab #cosmology #dark-energy

space4 months ago•72 min saved

Earth sits at the center of DESI’s stunning 3D map of the universe

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.

via Space|

#3d-map #cosmology #dark-energy