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The constellation of Cygnus is one of the most recognizable in the northern hemisphere. During the summer months, the stars of its long neck stretch along the Milky Way and its wings sweep from side to side. In this infrared view, the Milky Way's path of stars disappears to reveal tendrils of cold dust. This dust is part of the interstellar medium, which also contains gas. Far-infrared light is the key wavelength range for investigating stars and planet formation. When the interstellar medium gathers together under the attraction of its own gravity, it forms a giant molecular cloud. These can be hundreds of light-years across. Denser parts, just a few tenths of a light-year across, are known as molecular cloud cores. These are where stars and planets form.