The Solar System
THE SOLAR SYSTEM The Solar System [c] is the gravitationally bound system of the Sun and the objects that orbit it. The largest of such objects are the eight planets , in order from the Sun: four terrestrial planets named Mercury , Venus , Earth and Mars , two gas giants named Jupiter and Saturn , and two ice giants named Uranus and Neptune . The terrestrial planets have a definite surface and are mostly made of rock and metal . The gas giants are mostly made of hydrogen and helium , while the ice giants are mostly made of ' volatile ' substances such as water , ammonia , and methane . In some texts, these terrestrial and giant planets are called the inner Solar System an...
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