The Dark Energy Spectroscopic Instrument (DESI) has achieved a significant milestone with the release of the largest 2D map of the Universe. This map, part of the DESI Legacy Imaging Surveys, was created to investigate the effects of Dark Energy, the enigmatic force driving the cosmos’ expansion.
Since its commissioning in 2012, DESI has utilized the NOIRLab’s Nicholas U. Mayall 4-meter Telescope at the Kitt Peak National Observatory (KPNO) to gather optical spectra for tens of millions of galaxies and quasars. The recent data release, known as DR 11, encompasses a staggering 5.6-trillion-pixel map that includes nearly four billion celestial objects, such as stars, galaxies, black holes, and asteroids. This extensive mapping covers approximately 75% of the sky in visible and near-infrared light, offering a profound view of the extragalactic Universe, now accessible to the public through the Legacy Survey Sky Viewer.
David Schlegel, co-lead of the Legacy Surveys and a scientist at the Lawrence Berkeley National Laboratory, remarked, “It’s part of the fabric of astronomy research now. When you’re working with astronomical objects today, you often start by pulling up the Legacy Imaging Viewer to see what you’re looking at.” More than 160 scientists contributed to this project, collaborating across various surveys including the Dark Energy Camera Legacy Survey (DECaLS) and the Beijing-Arizona Sky Survey (BASS).
The data was collected using multiple telescopes, including the Dark Energy Camera (DECam) and the UA Bok 2.3-meter Telescope, along with contributions from NASA’s Wide-field Infrared Survey Explorer (WISE). Arjun Dey, another co-lead of the Legacy Surveys, emphasized the importance of these images, stating, “Explorations of our Universe always start with images of the night sky. The DESI Imaging Legacy Surveys are just one step in this venerable human tradition.” He added that the data is crucial for understanding the expansion history of the Universe and the formation of galaxies.
The map builds upon earlier iterations of the DESI Legacy Imaging Surveys, which completed its initial five-year mission earlier this year, mapping over 47 galaxies and quasars in the local Universe out to 11 billion light-years. This 2D map allows DESI to select objects and analyze their light across different wavelengths, which is essential for creating the largest high-resolution 3D map of the Universe. This endeavor aims to explore how galaxies have clustered over time and to assess the influence of Dark Energy on cosmic evolution.
Preliminary findings from the DESI Legacy Imaging Surveys suggest that the impact of Dark Energy may be diminishing over time, challenging previous assumptions of its accelerating effects. This has significant implications for cosmological models, indicating that the Universe might not expand indefinitely.
Additionally, the map will aid astronomers and citizen scientists in studying various phenomena, including gravitational lenses, supernovae, and fast radio bursts (FRBs). It will also facilitate investigations into Dark Matter, which constitutes about 85% of the Universe’s mass, and support the development of machine learning tools to process vast amounts of astronomical data.
As part of its ongoing mission, DESI plans to publish enhanced results from its first five years of operations in 2027 and will continue observations until 2028. The full catalog of the DESI Legacy Surveys is also available as a searchable database via the Astro Data Lab at the Community Science and Data Center (CSDC).
This article was produced by NeonPulse.today using human and AI-assisted editorial processes, based on publicly available information. Content may be edited for clarity and style.
