Zone of Avoidance
In more recent years, many projects have attempted to bridge the gap in our knowledge caused by the Zone of Avoidance. However, the effects of the Zone drops at longer wavelengths, such as the infrared, and the Milky Way is effectively transparent at radio wavelengths. Surveys in the infrared have given us a more complete picture of the extragalactic sky. Indeed, two very large nearby galaxies, Maffei 1 and Maffei 2, were discovered in the Zone of Avoidance by Paolo Maffei by their infrared emission in 1968.  Even so, about 10% of the sky remains difficult to survey because extragalactic objects (for example, distant galaxies) can be confused with stars in the Milky Way.