By the time the scan is complete in 2026, DESI is expected to map more than 35 million galaxies, providing astronomers with a huge library of data.
the astrophysicist Julien Guy, of the Lawrence Berkeley National Laboratory in California, has explained what DESI has managed to map thanks to its 5,000 optical fibers, each individually controlled and positioned by a tiny robot.
“In the distribution of galaxies on the 3D map, there are huge clusters, filaments and voids. They are the largest structures in the universe. But within them, you find a trace of the early universe and the history of its expansion ever since.”
These optical fibers, which must be precisely placed to within 10 microns—or less than the width of a human hair—and then capture flashes of light as they filter down to Earth from the cosmos, form a network that takes images of the spectrum of color of millions of galaxies, covering more than a third of the entire sky. Additionally, DESI-mapped structures can be reverse-engineered to see the initial formation in which they started.
DESI’s main goal is to reveal more about the dark energy that is thought to make up 70% of the universe, as well as accelerate its expansion. this dark energy could lead galaxies to infinite expansion, collapse in on themselves, or something in between, and cosmologists are eager to narrow down the options.
/ DAY / MQ