the Big Dipper; the Plow; the seven brightest stars of the constellation Ursa Major

A celestial body that orbits a planet, such as a moon; an artificial object placed in orbit around the earth or another planet for communication or research

to navigate or provide guidance for a vehicle; using radar, satellites, or radio signals to direct the course of an aircraft, ship, or car

A whole composed of parts that work together to perform a function or achieve a goal; a series or group of related things forming a complex whole.