DESI has made the largest 3D map of our universe to date. Earth is at the center of this thin slice of the full map. In the magnified section, it is easy to see the underlying structure of matter in our universe. Credit: Claire Lamman/DESI collaboration; custom colormap package by cmastro), mounted on a telescope in Arizona, has created the largest 3-D map of the cosmos, mapping over 30 million galaxies and 3 million quasars.
Rockosi led the commissioning of the instrument at the 4-meter Mayall telescope at Kitt Peak National Observatory, and her present role is as an instrument scientist, helping to keep it running in top shape. In addition, the professors credit “a phenomenal team” of UC Santa Cruz undergrads, grad students, and postdocs who have been deeply engaged with the project—visiting the telescope in Arizona on a regular basis to help with observations.
“The goal is to measure how DESI galaxies bend and distort the light from more distant galaxies located behind them, an effect known as gravitational lensing,” said Heydenreich, who spent a week on site at Kitt Peak at the end of 2023. “These measurements will be essential for analyzing how galaxies are influenced by the distribution of dark matter surrounding them.
Looking at DESI’s map, it’s easy to see the underlying structure of the universe: strands of galaxies clustered together, separated by voids with fewer objects. Our very early universe, well beyond DESI’s view, was quite different: a hot, dense soup of subatomic particles moving too fast to form stable matter like the atoms we know today. Among those particles were hydrogen and helium nuclei, collectively called baryons.
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