planet cultural definition

An object in orbit around a star. A planet does not give off its own light; rather, it shines by reflecting sunlight. Planets close to the sun are rocky. Those farther out consist mostly of gases and liquids.

• There are nine major planets, including the Earth, in orbit around our sun, along with many asteroids. (See solar system.)
• Scientists have discovered evidence for the existence of many planets that circle other stars.