HETDEX and the ‘Quest for the Rest’

March 18, 2021

“The hundreds of billions of galaxies it contains, each of them home to billions of stars, planets, and moons as well as massive star-and-planet-forming clouds of gas and dust, and all of the visible light and other energy we can detect in the form of electromagnetic radiation (such as radio waves, gamma rays, and X-rays)—in short, everything we’ve ever seen with our telescopes—only amounts to about 5 percent of all the mass and energy in the universe.”

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