Fixed stars
（重定向自Background star）
The fixed stars (from the Latin stellae fixae) are celestial objects that do not seem to move in relation to the other stars of the night sky. Hence, a fixed star is any star other than the Sun. A nebula or other starlike object may also be called a fixed star. People in many cultures have imagined that the stars form pictures in the sky called constellations. In Ancient Greek astronomy, the stars were believed to exist on a giant celestial sphere, or firmament, that revolves daily around Earth.