a bright, glowing area visible wavelengths of light not seen with the naked eye a distinct pattern or shape colors that may range from red to blue, green, yellow, and even ultraviolet a source of the emission, such as an object, star, or galaxy
emission which is a bright, glowing area emission which has visible wavelengths of light not seen with the naked eye emission which is a distinct pattern or shape emission which has colors that may range from red to blue, green, yellow, and even ultraviolet emission which is a source of the emission, such as an object, star, or galaxy