Functions and Types of Satellites:

Satellites can be divided into five principal types based on their functions i.e.
(i) Research
(ii) Communications
(iii) Weather
(iv) Navigation
(v) Applications and
(vi) Military satellites


its five or six?(surely five)

2-Earth's Moon is the most obvious example and was the only one known until the discovery of the Jupiter in 1610


the Earth's Moon is the most obvious example and was the only one known until the discovery of the Galilean satellites of Jupiter in 1610
(i think this is complete information)

3-inner five of Jupiter, inner seven of Saturn etc.
i think jupiter have 8 regular satellites link http://en.wikipedia.org/wiki/Moons_of_Jupiter