Hydrogen halo lifts the veil of our galactic home
(PHYSorg.com Space & Earth)

Sometimes it takes a lot of trees to see the forest. In the case of the latest discovery made by astronomers at the University of Arizona, exactly 732,225. Except that in this case, the `forest` is a veil of diffuse hydrogen gas enshrouding the Milky Way, and each `tree` is another galaxy observed with the 2.5-meter telescope of the Sloan Digital Sky Survey.