Discovering the Solar System: Planets, Sizes, and Composition
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The Solar System, formed from a giant molecular cloud around 4.6 billion years ago, comprises the Sun and celestial bodies bound by its gravity. It includes four terrestrial planets—Mercury, Venus, Earth, and Mars—primarily made of rock and metal. In contrast, the four gas giants—Jupiter, Saturn, Uranus, and Neptune—are composed largely of hydrogen and helium, boasting significantly greater mass. The Sun is the largest object, with a diameter of 1,392,000 km, while the planets vary in size, with Mercury at 4,878 km and Jupiter reaching 142,800 km.
Discovering the Solar System: Planets, Sizes, and Composition
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Presentation Transcript
The Solar System consists of the Sun and those celestial objects bound to it by gravity, all of which formed from the collapse of a giant molecular cloud approximately 4.6 billion years ago.
The four smaller inner planets; Mercury, Venus, Earth and Mars, also called the terrestrial planets, are primarily composed of rock and metal.
The four outer planets, Jupiter, Saturn, Uranus and Neptune, also called the gas giants, are composed largely of hydrogen and helium and are far more massive than the terrestrials.
Planet Sizes In Equatorial Diameter (km), the Sun is the largest at 1,392,000km. Mercury is 4,878km and Venus is 12,104km . Earth is almost the same size as Venus at 12,756 km. Mars is 6,787km. Jupiter and Saturn are both large planets at 142,800km and 120,000km respectively.
