The Dark Energy Spectroscopic Instrument (DESI) has received formal approval from the US Department of Energy (DoE) to move from the design phase to construction. That means the DoE will start building the tool next year. The agency-backed project, to 3D map millions of galaxies across the universe in 2019, has passed “Critical Decision 3” almost a year after it went through the second phase of approval.
“The DESI map of galaxies will reveal patterns that result from the interplay of pressure and gravity in the first 400,000 years after the Big Bang. We’ll be using these subtle fingerprints to study the expansion history of the universe.”