Zone Of Avoidance (zoa)

Region of sky that is obscured at optical wavelengths by our own galaxy, the Milky Way. It covers roughly 20% of the sky and is centered along the galactic equator, the ZoA is irregular in shape, varying in height with the widest point located towards the center of our Galaxy in the constellation Sagittarius. Extragalactic objects (red dots in figure) do exist in this region of sky, but the extinction through the Galactic plane is very high (Galactic dust and dense gas absorb light from background sources). The high concentration of stars also makes faint extragalactic objects difficult to detect within the ZoA. To penetrate the ZoA, we must observe this region at wavelengths that are not as affected by dust (such as infrared, radio, and X-rays).