Instructive model of educational focal point. Solar system can be n ice I y explained with this convenient model. It illustrates approximately the comparative size and colour of planets, in the centre an electric bulb represents the Sun, Mercury, Venus, Earth, Mars, Jupiter, Saturn & three additional planets Neptune, Uranus & Pluto revolve round the sun in the same plane but at different orbits. Their situations in 12 zodiacal signs can be shown on the printed base. Complete with instructions.