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| title | chunk | source | category | tags | date_saved | instance |
|---|---|---|---|---|---|---|
| Dark Energy Spectroscopic Instrument | 3/3 | https://en.wikipedia.org/wiki/Dark_Energy_Spectroscopic_Instrument | reference | science, encyclopedia | 2026-05-05T09:47:16.561008+00:00 | kb-cron |
=== Early data release === On 13 June 2023 the DESI Early Data Release (EDR) was announced. The EDR contains spectra of nearly two million galaxies, quasars and stars. One early result of the EDR was announced in February 2023 and described a mass migration of stars into the Andromeda Galaxy. The EDR also revealed very distant quasars and very metal-poor stars. In 2025, a team led by Ragadeepika Pucha of the University of Arizona and the University of Utah reported in The Astrophysical Journal the discovery of the largest number of dwarf galaxies including 2,800 black holes (300 intermediate-mass black holes and 2,500 active black holes) from the EDR.
==== Possibly evolving dark energy levels ==== From the level of detail able to be observed, the largest 3-D map of the universe at this point has been created (2024). From this precise data, DESI Director Michael Levi stated:We’re also seeing some potentially interesting differences that could indicate that dark energy is evolving over time. Those may or may not go away with more data, so we’re excited to start analyzing our three-year dataset soon.
=== Data Release 1 (DR1) === Data Release 1 (DR1), published on 19 March 2025, contains 18.7 million objects. These objects comprise roughly 4 million stars, 13.1 million galaxies, and 1.6 million quasars. One outcome of these big data were hints of an evolving dark energy. If the data hold, this would mark the first major change in our understanding of the universe in decades. Whilst the DESI observations as such are consistent with the Lambda CDM model, in combination with past surveys of the cosmic microwave background, supernovae, and weak lensing the data show that the influence of dark energy weakens over time. The signal does not reach 5 sigma, but nonetheless at 2.8 to 4.2 sigma heralds a new era of research. The causes of the variation itself are not yet known.
== See also == Dark Energy Survey (DES)
== References ==
== External links ==
Official DESI site Astronomers complete largest 3D map of the universe ever made. Progress report, Science News, 15 Apr 2026. Index| Legacy Survey Legacy Survey Sky Browser Science Final Design Report Instrument Final Design Report DESI data Key publications Omnibus DESI collaboration Telescope tracks 35 million galaxies in Dark Energy hunt, BBC Science report, 28 October 2019