A solar system

A solar system consists of the Sun and all the bodies that circulate around it. The sun is a star that produces its own light. Objects called planets revolve star. Most planets have a satellite (moon) that runs around it. In our solar system there are nine planets all circle around the sun.

A planet can be divided into two groups: large planets and small planets. Mercury, Venus, Earth and Mars form a group of four small planet earth and kind. The fourth planet is composed of material density averaged four or five times the density of water.

Jupiter, Saturn and Neptune is much larger than Earth type planets. The radius of Jupiter is more than eleven times the radius of Earth, and the volume is approximately 1320 times greater. Saturn has a radius of 60,400 km, is nearly 10 times the radius of Earth. Jupiter and Saturn have many satellites. Uranus has a radius of 23,700 km in length, while the teak-finger Neptune has 22 300 km. Pluto has a radius of 3200 km, this means that Pluto is smaller than Mars.