EUROPEAN SOUTHERN OBSERVATORY / L. CALCADA / SCIENCE PHOTO LIBRARY EUROPEAN SOUTHERN OBSERVATORY / L. CALCADA / SCIENCE PHOTO LIBRARY
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Young galaxy. Artwork of a young galaxy, about two billion years after the Big Bang, accreting streams of cooler hydrogen and helium (top and bottom) from the heated galactic halo into the core to form new stars. This process means that violent galactic mergers are not needed to drive vigorous star formation, and helps to explain the large increase in the mass of galaxies a few billion years after the Big Bang. The evidence for this previously unknown process was obtained in a 2010 study that used the SINFONI (Spectrograph for Integral Field Observation in the Near Infrared) instrument on ESO's Very Large Telescope.Restrictions:.
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