Basics

   The solar system consists of the Sun; the nine planets, sixty seven (67) satellites of the planets, a large number of small bodies
(the comets and asteroids), and the interplanetary medium. The inner solar system contains the Sun, Mercury, Venus, Earth and Mars:

 

The planets of the outer solar system are Jupiter, Saturn, Uranus, Neptune and Pluto:

  The orbits of the planets are ellipses with the Sun at one focus, though all except Mercury and Pluto are very nearly circular.
The orbits of the planets are all more or less in the same plane (called the ecliptic and defined by the plane of the Earth's orbit).
The ecliptic is inclined only 7 degrees from the plane of the Sun's equator. Pluto's orbit deviates the most from the plane of the
ecliptic with an inclination of 17 degrees. The above diagrams show the relative sizes of the orbits of the nine planets from a
perspective somewhat above the ecliptic (hence their non-circular appearance). They all orbit in the same direction
(counter-clockwise looking down from above the Sun's north pole); all but Venus, Uranus and Pluto also rotate in that same sense.