round object

made of burning gas

The sun is a star. It is the largest object in the solar system.

large, round object

orbits a star, such as the sun

Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune are planets.

large, round object

doesn't orbit the sun

orbits a planet, such as Earth

small, rocky object

orbits the sun

found between the orbits of Mars and Jupiter