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To balance the telescope they have to carry trays of solid lead weights the size of envelopes up into its belly. Two by two they would screw on each weight and then test it, then add more weight to certain spots and test it again. They were just weeks away from collecting what astronomers call “first light.” The lucky first object of DESI’s gaze would be a spiral galaxy called Triangulum, 2.7 million light years away. This particular galaxy has been studied so much over the years that its spectra is very well known, making it a sort of galactic calibrator.

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