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Topping Off a Telescope with New Tools to Explore Dark Energy

Key components for the sky-mapping Dark Energy Spectroscopic Instrument, weighing about 12 tons, were hoisted atop the Mayall Telescope at Kitt Peak National Observatory near Tucson, Arizona, and bolted into place last week, marking a major project milestone. https://newscenter.lbl.gov/2018/12/04/topping-off-a-telescope-with-new-tools-to-explore-dark-energy/