image: Image of the region of the space occupied by the rare quasar quartet. The four quasars are indicated by arrows. The quasars are embedded in a giant nebula of cool dense gas visible in the image as a blue haze. The nebula has an extent of one million lightyears across, and these objects are so distant that their light has taken nearly 10 billion years to reach telescopes on Earth. This false color image is based on observations with the Keck 10m telescope on the summit of Maunakea in Hawaii. This material relates to a paper that appeared in the May 15, 2015 issue of Science, published by AAAS. The paper, by J.F. Hennawi at Max-Planck-Institut für Astronomie in Königstuhl, Germany, and colleagues was titled, 'Quasar quartet embedded in giant nebulae reveals rare massive structure in distant universe.' view more
Credit: [Credit: Hennawi & Arrigoni-Battaia, MPIA]