What is the hazy layer that surrounds a comet and acirc and 128 and 153s nucleus?

The hazy layer that surrounds a comet's nucleus is called the coma. This cloud of gas and dust forms when the comet approaches the Sun, causing its ices to sublimate and release volatile materials. The coma can extend thousands of kilometers into space and is often illuminated by sunlight, giving comets their characteristic glowing appearance. Additionally, the solar wind and radiation pressure can shape the coma and create a tail that points away from the Sun.