The Science Vision for the Stratospheric Observatory for Infrared
  Astronomy (SOFIA)
  An updated Science Vision for the SOFIA project is presented, including an
overview of the characteristics and capabilities of the observatory and first
generation instruments. A primary focus is placed on four science themes: 'The
Formation of Stars and Planets', 'The Interstellar Medium of the Milky Way',
'Galaxies and the Galactic Center' and 'Planetary Science'.
