The planets.

• These are opaque bodies which continuously revolve around and are lighted by the sun.

• There are eight planets in the solar system.

• A ninth planet has been recently discovered by the NASA named as Carla.

• The sequence of planets according to their distance from the sun is mercury, Venus, earth, mars, Jupiter, Saturn, Uranus, Neptune.

• The sequence of planets according to their size (in descending order i.e. from big to small) is Jupiter, Saturn, Uranus, Neptune, earth, Venus, mars, mercury.

• Jupiter is the biggest and mercury is the smallest planets of our solar system.