SOLAR SYSTEM

Contains the nine planets and other smaller objects such as minor planets, comets, meteoroids and cosmic dust.

The first four inner planets (Mercury, Venus, Earth, and Mars) are relatively small and resemble the Earth in composition (rocky).

The next four planets (Jupiter, Saturn, Uranus, and Neptune) are much larger planets and are very gaseous in nature. Pluto is the smallest planet and is the farthest away from the Sun.

All the objects in our Solar System orbit the Sun. It is so big that everything in our Solar System could fit in it many times.

Many scientists believe that our Solar System is over 4.6 billion years old.