DESI Creates Largest and Most Detailed Map of Universe Ever astronomy space science
, a multi-object survey spectrograph installed on the Nicholas U. Mayall 4-m Telescope at Kitt Peak National Observatory, has cataloged more galaxies than all other previous 3D redshift surveys combined, measuring 7.5 million galaxies in only seven months since beginning science operations. Yet it’s only about 10% of the way through its five-year mission.
By breaking down the light from each galaxy into its spectrum of colors, DESI can determine how much the light has been redshifted — stretched out toward the red end of the spectrum by the expansion of the Universe during the billions of years it traveled before reaching Earth. Those structures carry echoes of their initial formation, when they were just ripples in the infant cosmos.
Today, about 70% of the content of the Universe is dark energy, a mysterious form of energy driving the expansion of the Universe ever faster. Answering these questions means learning more about how dark energy has behaved in the past — and that’s exactly what DESI is designed to do.
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