The solar ____ was formed approximately 4.6 ____ years ago by the collapse of a giant molecular cloud. The mass at its centre collected to form the ____ and a flat disk of dust around it. This eventually formed the planets and other bodies of the solar system. 99.86% of the solar system’s ____ is found in the Sun. The majority of the remaining 0.14% is contained within the ____ planets (nine if you include the dwarf planet, ____ ). The four smaller inner planets, also known as the “terrestrial planets”, are primarily composed of rock and ____ whereas the four outer planets, also known as the “gas giants”, are substantially larger than the inner planets. The two innermost ____ giants, Jupiter and Saturn, are the largest of the four outer planets and are composed mainly of hydrogen and ____. Uranus and Neptune, The two outermost gas giants, are composed largely of ices ( ____, ammonia and methane). Together they are referred to as the “ice giants“.

SOLAR SYSTEM FACTS

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