Hobby–Eberly Telescope Dark Energy Experiment
programAstronomy
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Early Galaxies Were Surrounded by Huge Clouds of Hydrogen, and Astronomers Found a Whole Bunch!
Astronomers discovered tens of thousands of hydrogen gas halos surrounding early galaxies, dating back 10 to 12 billion years, using data from the Hobby–Eberly Telescope Dark Energy Experiment (HETDEX). Led by Erin Mentuch Cooper and Karl Gebhardt, this research significantly expands the catalog of known halos, enhancing understanding of cosmic evolution during Cosmic Dawn.