You can find infomration on discovery of solar sysyem objects at
http://en.wikipedia.org/wiki/Timeline_of_discovery_of_Solar_System_planets_and_their_moons
The "ice giant" planets are Uranus and Neptune. For their properties, see
http://www.astrophysicsspectator.com/topics/planets/GiantIcePlanets.html
How were the different objects in the solar system discovered? What are the properties of the ice giants?
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