The solar system was formed 4.6 billion years ago due to the gravitational collapse of a huge interstellar molecule cloud. Most of the system's mass is in the Sun and most of the rest is in Jupiter. The four small inner planets, Mercury, Venus, Earth and Mars, are planets on earth, mainly composed of rocks and metals. The four outer planets are huge planets that are much larger than the Earth.
The two largest planets, Jupiter and Saturn, are gas giants, mainly composed of hydrogen and helium. The two outermost planets, Uranus and Neptune, are composed of ice giants called volatiles such as water, ammonia, and methane, which have relatively high melting points compared to hydrogen and helium. .. All eight planets have an almost circular orbit in an almost flat disk called the ecliptic.
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The solar system also contains smaller objects. [f] The asteroid belt between the orbits of Mars and Jupiter is composed of rocks and metals, almost like Earth planets, and contains objects. Beyond Neptune's orbit is the Kuiper Belt and Scattered Disc, a group of trans-Neptune objects that are mostly composed of ice, and beyond that is the newly discovered group of Sedunoids. Some objects in these populations are large enough to ring under their own gravity, but there is considerable debate about how many objects there are. [9] [10]
These objects are classified as small planets. The only particular dwarf planet is Pluto, and it is expected that there will be another Neptune object, Ellis, and the asteroid Ceres is at least on the dwarf planet. [f] is free to move between both regions, as well as various other body population comets, including centaurs and interplanetary dust clouds. Six of the planets, six of the largest dwarf planets possible, and most of the smaller objects are orbited by natural satellites, commonly called the 'Moon,' after a few months. Each outer planet is surrounded by a planetary ring of dust and other small objects.
The solar wind is a flow of charged particles that flow outward from the sun, creating a bubble-like region in the interstellar medium known as the heliosphere. The heliopause is where the pressure of the solar wind is like the opposite pressure of the interstellar medium. It extends to the edge of the scattered disc. The Ort cloud, the source of long-term comets, can be about a thousand times farther than the heliosphere. The solar system is located on the arm of Orion, 26,000 light-years from the center of our galaxy.
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