Solar System

A solar system is made up of a star and everything that travels around it. Solar means "of the sun." In our Solar System, the Sun is orbited by the terrestrial planets Mercury, Venus, Earth, and Mars, the gas planets Jupiter, Saturn, Uranus, Neptune, and Pluto, and the ring of comets known as the Kuiper Belt. Its outer edge is the spherical cloud of comets called the Oort Cloud.

Size: about 1.6 light-years across
Boundary: Oort Cloud
Rotation around Sun: counterclockwise
Star size: average
Age: about 4.6 billion years
Contents: terrestrial planets, gas giants, Asteroid Belt, Kuiper Belt, Oort Cloud
Location: in Orion arm of the Milky Way galaxy

Image credits: courtesy of NASA.