Definition: The term "nebulosities" is a term used in astronomy to describe the density of gas or dust particles that surround and accumulate within a star's corona. They are often described as being invisible, but they can be seen through telescopes and visible light. The term originally referred to the densest layer of gas known as the corona, but it is now commonly used in describing the more complex layers of material that make up the outer parts of a star's atmosphere.
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