Solar sistem
The Solar System[a]
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.
Of the retinue of objects that
orbit the Sun,...
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Solar sistem
The Solar System[a]
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.
Of the retinue of objects that
orbit the Sun, most of the mass is contained within eight relatively solitary
planets whose orbits are almost circular and contained within a nearly-flat
disc called the ecliptic plane.
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.
The Solar System is also home to two regions populated by smaller objects.
The asteroid belt, which lies between Mars and Jupiter, is similar to the
terrestrial planets as it is composed mainly of rock and metal.
Beyond
Neptune s orbit lie trans
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