The Dark Energy Spectroscopic Instrument project has completed the largest map of the universe ever created, compiling 5.6 trillion pixels of data across 13 years of observations to chart roughly 75 percent of the night sky, according to findings detailed by project researchers.
Mapping Four Billion Celestial Objects in the Cosmos
The newly released map incorporates data gathered from 263,407 individual telescope exposures, cataloging approximately four billion distinct celestial objects. Located on a remote mountain in Arizona’s Sonoran Desert, the Dark Energy Spectroscopic Instrument team stitched together visible light and near-infrared wavelengths to build the massive digital canvas. David Schlegel, a researcher at the Lawrence Berkeley National Laboratory and co-lead of the Legacy Surveys, noted in a press release that the dataset has already become foundational for the field, stating that researchers frequently rely on the Legacy Imaging Viewer to examine astronomical targets.
Did you know?
The Milky Way is shaped like a fried egg, which creates a dense band of stars in the night sky that blocks ground-based telescopes from seeing deeper into space. To bypass this, researchers pointed DESI’s 5,000 mechanical eyes out of the top and bottom of our galaxy.
Unlocking the Mysteries of Dark Energy and Dark Matter
The primary scientific motivation behind the mapping effort is to decode dark energy and dark matter, the mysterious forces driving the universe’s accelerated expansion. While dark energy remains elusive, astronomers track its behavior by analyzing how fast celestial objects move away from Earth. Earlier this year, DESI researchers released a separate map projecting the distances of 47 million galaxies and quasars, reconstructing 11 billion years of cosmic history to bring the effects of dark energy into clearer focus.
Public Access Through the Legacy Survey Sky Viewer
Unlike previous astronomical catalogs restricted strictly to professional laboratories, the new dataset is fully open to the public through online tools like the Legacy Survey Sky Viewer. Anyone with an internet connection can use the free online platform to explore the vast imaging data, zoom through the universe, and inspect everything from nearby asteroids to distant black holes.
Engineering and Collaboration Behind the Telescope Survey
Constructing the atlas required combining data from three major telescopic campaigns, including the Nicholas U. Mayall 4-meter Telescope at the Kitt Peak National Observatory operated by NSF NOIRLab. More than 160 scientists participated in the data collection over the multi-year project, producing over 1,800 peer-reviewed scientific papers that rely on the survey’s findings.
Frequently Asked Questions
What is the Dark Energy Spectroscopic Instrument?
DESI is a scientific instrument stationed in Arizona that maps the cosmos using 5,000 mechanical eyes to capture light from millions of galaxies, quasars, and stars.
Can the public view the new space map?
Yes. The DESI Legacy Imaging Surveys team made the 5.6-trillion-pixel map available for free online exploration through the Legacy Survey Sky Viewer.
Why is mapping the Milky Way difficult from the ground?
Gas, dust, and a dense concentration of stars within our own galaxy block direct views of deeper space, requiring telescopes to look outward from the top and bottom of the galactic disk.
Worth a look