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.