Solar System (EXPLAINED)

The solar system

The solar system has a radius of 150 light-years. The state of the solar system is the scattered stars in the Milky Way, called local interstellar clouds. It is an interstellar medium that is shaped like an hourglass. Gas is dense and stars are rare. The diameter is about 300 light-years. This region is called the local galactic bubble.

The solar system is located in the Milky Way, known as the Milky Way (a 200 light-year-old spiral-forbidden spiral galaxy, with more than 200 billion stars, as spiral galaxies). Our Sun lies on the spiral arm on the periphery of the Milky Way, known as the Orion armor local arm. The Sun is 25,000 to 28,000 light-years from the center of the Milky Way and the speed in the Milky Way is about 220 km / s. Therefore, it would take about 225 to 250 million years to orbit the Milky Way. This revolutionary cycle is called the Galaxy of the Year.

The first discovery of the solar system was commissioned by a telescope when astronomers first began mapping these dim objects that were invisible to the naked eye.

Galileo was the first astronomer to find a description of the objects of the solar system. He found the crater of the moon, the sunlight on the surface of the sun and Jupiter surrounded by four moons. Huygens followed Galileo's discovery and discovered the shape of Saturn's moon Titan and Saturn's rings. After this Cassini found the four moons of Saturn, the Cassini seam of the ring of Saturn, the great red spot of Jupiter.
The Milky Way is a forbidden spiral galaxy with a diameter of about 100,000 light-years, consisting of 100 billion to 400 billion stars. The sun is a typical star of the Milky Way, located on a branched cantilever Orion arm. It is 26,100 light-years away from the center of the Milky Way. The speed of the solar system around the center of the Milky Way is about 240 systems, and it is about 226 million years.

Almost all of the eight major planets in the solar system are in nearly circular orbits in the same plane and revolve around the Sun in the same direction. Except for Venus, the rotation and revolution directions of other planets are the same. Comet orbits around Japan are mostly the same, most of which are elliptical orbits, and usually have relatively long orbital periods.

: In addition to the solar system, the universe also has the Milky Way. There are many similar astronomical systems outside the Milky Way, called extragalactic galaxies, often called galaxies. Currently, 100 billion galaxies have been observed, and scientists estimate that there are at least 2 trillion galaxies in the universe. Galaxies are divided into groups, called galaxy clusters. TheMilky They are big. Milky Way is the galaxy to which the Earth and the Sun belong. The Milky Way is the star system in which the solar system is located. It contains 120 billion stars and a large number of star clusters, nebulae, and a variety of interstellar gases and interstellar dust.

The solar system we are in now is the stellar system. It consisted of the Sun, eight large planets (originally nine planets, as Pluto was removed as a dwarf planet), 66 satellites (the original 67, Pluto's satellites were removed), and countless asteroids, comets and There are meteorites. The order of the planets from the Sun is: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune. Mars close to Mercury, Venus, Earth and Sun are called terrestrial planets. The spacecraft has detected them all, and landed on Mars and Venus with significant results. Their common features are high density (> 3.0 g / cm3), small volume, slow rotation, some satellites, internal components predominantly silicate, and they have a solid shell. Jupiter, Saturn, Uranus and Neptune from the Sun are called Jovan planets. They all have very rough atmospheres, and their surface characteristics are difficult to understand. Generally, they have the same solid cores as all terrestrial planets. Between Mars and Jupiter, there are more than 1,000,000 asteroids (that is, a body composed of irregular asteroid rocks). It is speculated that they may have formed from the fragmentation of a planet located between Mars and Jupiter, or some stone fragments that failed to accumulate as a unified planet. Meteorites exist between planets and are made of stone or iron. These planets revolve in elliptical orbits around the Sun, although Mercury is very close to the circle. Planetary orbits are more or less on the same plane (known as the ecliptic plane and based on the Earth's orbital plane). The ecliptic plane is only 7 degrees from the solar equator. Pluto's orbit is mostly away from the ecliptic plane with an inclination of 17 degrees. The chart above shows the relative size and relationship of each track from a specific point of view above the ecliptic plane (non-circular events are evident). They are rotating in the same direction (counterclockwise from the sun's north pole), so the scientists excluded Pluto from the nine planets. The direction of rotation is the same except for Venus and Uranus. Although it is only a small and medium-sized star, its mass accounts for 99% of the total mass of the solar system. 85%; The remaining mass includes planets and their satellites, planetary rings, as well as asteroids, comets, Kuiper Belt objects, Neptune objects, theoretical Oort Clouds, interplanetary dust, gases, and particles. Interstellar Matter. The total surface area of ​​all celestial bodies in the entire solar system is approximately 1.7 billion square kilometers. The Sun tightly controlled all the celestial bodies of the Solar System by their strong gravitational force, which they orbit in a systematic manner. At the same time, the Sun moves all the members of the Solar System around the center of the galaxy. So far eight major planets have been discovered in the solar system. They are sometimes called "eight planets". There are eight major planets by distance from the Sun: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune. Mercury, Venus, Earth and Mars are also called terrestrial planets, Jupiter and Saturn are also called giant planets, and Uranus and Neptune are also called distant planets. Except for Mercury and Venus, other planets have moons. There are hundreds of thousands of asteroids of varying sizes and shapes between Mars and Jupiter. Astronomers call the region an asteroid belt. In addition, there are more than 1,000 comets in the solar system, as well as countless small objects such as dust, ice clusters and fragments. Each celestial body in the solar system is mainly composed of hydrogen, helium, neon and other gases, ice (water, ammonia, methane) and rocks that contain elements such as iron, silicon, and magnesium. Planets like Earth, Earth, Moon, Mars, Jupiter and some satellites and asteroids are mainly made up of rocks; Jupiter and Saturn are primarily composed of hydrogen and helium, and their cores may be rocks or ice. The Galaxy is the Milky Way galaxy to which the Earth and the Sun belong.

 The Milky Way is vortex-shaped, with four spiral-shaped spiral arms that extend evenly and symmetrically from the center of the Milky Way. The center of the galaxy and the four spiral arms are dense with stars. From a distance, the Milky Way is like a big discus for physical exercise. The diameter of the larger discus is 100,000 light-years, which is equivalent to 94608 billion kilometers. The thickest part in the middle is about 3000–6500 light-years. About 33,000 light-years from the center of the Milky Way, the Sun is on a spiral arm called the Orion Arm. The discovery of the Milky Way has gone through a long process.