A "fuzzy" dark or light patch in the sky is called a:

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A fuzzy dark or light patch in the sky is commonly known as a nebula. Nebulae occur when clouds of gas and dust in space are illuminated by nearby stars or reflecting their light. They come in different shapes and sizes and can be observed with telescopes or binoculars. Fuzzy dark or light patches in the sky are often nebulae, which are clouds of gas and dust in space. Clouds and dust lanes can also appear fuzzy in the sky, but they would not necessarily have the same astronomical significance as a nebula. Galaxies and comets may have a fuzzy appearance, but they would not typically be referred to as "patches" in the sky.

A "Fuzzy" Dark or Light Patch in the Sky Is