One of the "first light" spectra taken by the Baryon Oscillation Spectroscopic Survey (BOSS). The top panel shows the targeted blue quasar, highlighted in the image of the sky, which are thought to be supermassive black holes in distant galaxies. At the bottom is shown the BOSS spectrum of the object which allows astronomers to measure the "redshift", or distance to this object. BOSS plans to collect millions of such spectra and use their distances to map the geometry of the universe.
D. Hogg/V. Bhardwaj/N. Ross