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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