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PLANETS

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Planets, Satellites, Comets and Asteroids

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Âge recommandé: 13 ans
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Ecuador

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PLANETS

Planets, Satellites, Comets and Asteroids

Karina Castillo
1

gas water ammonia 6 Earth ice Mercury Venus Saturn gravitational Sun Jupiter helium methane Neptune Jupiter Uranus 4 eight Solar smallest Mars hydrogen

The System is the gravitationally bound system of the and the objects that orbit it , either directly or indirectly . Of the objects that orbit the Sun directly , the largest are the planets , with the remainder being smaller objects , the dwarf planets and small Solar System bodies . Of the objects that orbit the Sun indirectly ? the moons ? two are larger than the planet , Mercury .

The Solar System formed . billion years ago from the collapse of a giant interstellar molecular cloud . The vast majority of the system's mass is in the Sun , with the majority of the remaining mass contained in . The four smaller inner planets , , , and , are terrestrial planets , being primarily composed of rock and metal . The four outer planets are giant planets , being substantially more massive than the terrestrials . The two largest , and , are giants , being composed mainly of and ; the two outermost planets , and , are giants , being composed mostly of substances with relatively high melting points compared with hydrogen and helium , called volatiles , such as , and . All eight planets have almost circular orbits that lie within a nearly flat disc called the ecliptic .