The Zone of Avoidance is the area of the night sky that is obscured by our own galaxy, the Milky Way. Interstellar dust and stars in the plane of the Milky Way (the galactic plane) obstruct our view of around 20% of the extragalactic sky at visible wavelengths. As a result, optical galaxy catalogues are usually very incomplete close to the galactic plane.
It's also the title of my third ambient LP. More news soon.