Hobby-Eberly Telescope Dark Energy Experiment ( HETDEX )
" Astronomers Create the Largest 3D Map of the Early Universe’s Hydrogen Glow " - Gadgets360 The Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) is a major spectroscopic survey at McDonald Observatory aimed at understanding dark energy—the force accelerating the universe's expansion. Using the 10-meter Hobby-Eberly Telescope (HET) and VIRUS spectrographs, it maps over one million galaxies 9–11 billion light-years away. HETDEX is currently collecting data on at least one million galaxies that are 9 billion to 11 billion light-years away, yielding the largest map of the early universe ever produced. Key Details of HETDEX: Goal: To measure the expansion rate of the universe and determine if dark energy changes over time by mapping the 3D positions of over a million distant galaxies (specifically, Lyman-alpha emitters). Instrument: The survey uses VIRUS (Visible Integral-Field Replicable Unit Spectrograph), which consists of 150 spectrographs connected by 33,000+ op...