Ultraprecise measurements in XXL
Powerful survey instruments help us map the sky with incredible precision. But what ensures that the instruments themselves are precisely built?
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3-D galaxy-mapping project enters construction phase
From Berkeley Lab, Aug. 9, 2016: DESI, the Dark Energy Spectroscopic Instrument, will measure light from 35 million galaxies to provide new clues about dark energy. Fermilab is a collaborator on the Berkeley Lab project.