PLANETS

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Planets, Satellites, Comets and Asteroids

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planets

comets

asteroids

satellites

Âge recommandé: 13 ans

315 fois fait

Karina Castillo

Ecuador

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Compléter PLANETSVersion en ligne Planets, Satellites, Comets and Asteroids par Karina Castillo 1 6 Mars Solar smallest hydrogen helium Saturn Uranus Neptune 4 Jupiter eight ammonia gas water Jupiter ice gravitational Mercury methane Earth Venus Sun 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 .