by Nico Schuster (CPPM) 7 July 2026 When we look at the positions of the millions of galaxies DESI has measured, one thing jumps out immediately: galaxies are not spread out evenly. Instead, they clump and string together into a cosmic web: bright filaments of galaxies threaded around huge, almost empty voids, which are some […]
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The Dark Energy Spectroscopic Instrument (DESI)
The Dark Energy Spectroscopic Instrument (DESI) will measure the effect of dark energy on the expansion of the universe. It will obtain optical spectra for tens of millions of galaxies and quasars, constructing a 3D map spanning the nearby universe to 11 billion light years.The DESI Survey is being conducted on the Mayall 4-meter telescope at Kitt Peak National Observatory. DESI is supported by the Department of Energy Office of Science to perform this Stage IV dark energy measurement using baryon acoustic oscillations and other techniques that rely on spectroscopic measurements.
Latest News from DESI
As of 15 April 2026, DESI has completed observations for its originally planned five-year survey. It has now observed more than 47 million galaxies and quasars — far exceeding its original target of 34 million — along with over 20 million stars. DESI's work is not finished: the survey is continuing observations and extending its map across a larger region of the sky, enabling even tighter constraints on dark energy and other fundamental properties of the universe. Read more about this milestone in the April 2026 Berkeley Lab Press Release.
DESI Science
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5000 Eyes: Mapping the Universe with DESI is out now!
DESI's very own planetarium show is available for free to all planetariums. See the trailer and find more information here.
Translations in French, Spanish, Mandarin, and German are now available.
Highlights
DESI Begins
Latest Blog Posts

DESI Explores the Extragalactic Time Domain Universe
Follow up of Rubin Alerts Characterizes the Transient Sky 4 May 2026 Joan Najita (NOIRLab) With its large field of view and ability to acquire a lot of spectra simultaneously, DESI is well suited to many investigations beyond its primary mission of charting out the role of dark energy in the expansion history of the […]

DESI Reaches Mapping Milestone, Surpassing Expectations
With DESI having mapped the sky faster than anticipated, and studied with more galaxies and stars than planned, four collaborators reflect on the achievement 15 April 2026 Joan Najita (NOIRLab) and Sindhu Satyavolu (IFAE) Today the DESI dark energy experiment reached the remarkable milestone of having successfully mapped all of the sky it originally planned […]
Latest Press Releases
DESI Completes Planned 3D Map of the Universe and Continues Exploring
Lawrence Berkeley National Laboratory, 15 April 2026
New DESI Results Strengthen Hints That Dark Energy May Evolve
Lawrence Berkeley National Laboratory, 19 March 2025
DESI Opens Access to the Largest 3D Map of the Universe Yet
Lawrence Berkeley National Laboratory, 19 March 2025
New DESI Results Weigh in on Gravity
Lawrence Berkeley National Laboratory, 19 November 2024
