Vocabulary#8 The Inner Solar System

Planet:Alarge body orbiting a star,such as the Sun.
S:In the solar system exist 7 planets.

Solar System:A star,such as the Sun,and all the objects orbiting it.
S:The solar system is the Sun and other bodies traveling around it.

Asteroid:A rocky,metallic object that orbits the sun.
S:The asteroids are too small to be consider a planet.

Kepler`s laws:Laws that summarize the movement of the planets.
S:Exist three laws of Kepler.