From Earth, most of the Milky Way Galaxy is concentrated in a blurry band of light that stretches across the galactic plane. Many of the stars in the plane cannot be seen with visible-light telescopes because the clouds of dust and gas that fill the galactic spiral arms block the starlight from view. Using the dust-piercing infrared eyes of NASA’s Spitzer Space Telescope, Boston University (BU) astronomers have discovered nearly 100 new star clusters in the galactic plane, with each cluster containing tens to hundreds of never before seen stars.