Using Infrared Light to Survey the Milky Way Galaxy - NASA Goddard - cosmology

Studying our own galaxy is surprisingly difficult.First,because the Milky Way covers such a large portion of the sky that studying it can take a very long time;and second,because Astromomers must peer through thick dust that obscures distant starlight.Infrared light can pass through that dust and is a key tool for learning about the far side of our galaxy. Cosmology is the study of the origin and structures of the universe.