GalaxyPasadena CA (JPL) Dec 11, 2012 – Our solar system, with its colorful collection of planets, asteroids and comets, is a fleck in the grander cosmos. Hundreds of billions of solar systems are thought to reside in our Milky Way galaxy, which is itself just a drop in a sea of galaxies. The rarest and largest of galaxy groupings, called galaxy clusters, can be the hardest to find. That’s where NASA’s Wide-field Infrared Survey … more