readx;?“ Stars run out of life, turn into black holes, or explode again, which is known as a supernova explosion. Pen Fun Pavilion www.biquge.info Because this kind of star in the universe will burst out of geometric multiples of light, and when observed from the earth, it seems that a new star suddenly emits a bright light far beyond ordinary stars, so this kind of explosion is called a supernova explosion.

A supernova explosion is followed by the formation of new nebulae. These nebulae contain a variety of light and heavy elements, as well as water and even the original constituents of living matter. Over billions of years, new stars will form, and nebulae that are not strong enough to produce nuclear fusion will turn into new planets. Some of these planets are gas planets (only gaseous elements such as hydrogen, helium, methane), and some are solid planets (containing metallic elements such as iron).

The Sun is formed in this way, and the planets around the Sun are created by other nebulae around the Sun because of the lack of mass to form stars. Of course, theoretically, if the quality is really enough, it will also be attracted to the sun. The above theoretically illustrates the evolution of stars and planets in the universe in general. ”

"So when was the solar system formed?"

According to scientists' speculation:

The time of the Big Bang – about 15 billion years ago.

Pre-solar supernova exploded – about 6.6 billion years ago.

The solar system was formed - about 4.567 billion years ago.

The planets of the solar system formed about 4.54 billion years ago.

The moon formed - about 4.53 billion years ago.

The solar system was born out of nebulae formed by supernova explosions of previous stars.

About 4.54 billion years ago, the Earth and other planets in the solar system began to form within the solar nebula, a disk (ecliptic) formed by gas and dust left over from the formation of the sun. After 10 to 20 million years, it was roughly fully formed. ”

I asked, "How did the moon form?"

Sage: "Jupiter is the fifth planet in the solar system from the inside out, and it is also the largest and fastest rotating planet in the solar system. It has a mass of one-thousandth the mass of the Sun, but 2.5 times the mass of the other seven planets in the solar system combined.

Jupiter experienced a long gravitational struggle with the Sun during its formation, and finally Jupiter finally overcame the gravitational pull of the Sun and successfully took shape. 68 moons of Jupiter have now been discovered, which shows that Jupiter's gravitational pull is very strong, capturing a large number of moons.

About 4.53 billion years ago, there was a celestial body about the size of Mars and about 10% of the mass of the Earth, Theia.

In the gravitational struggle between the Sun and Jupiter, Theia was thrown out of Jupiter's gravitational range and crashed into the Earth at a speed of about 5 kilometers per second. The violent collision not only changed the state of motion of the Earth and tilted the Earth's axis, but also caused Theia to be fractured by the impact.

The collision also changed the Earth's orbital distance around the Sun. Without this collision, it is possible that the Earth would be farther away from the Sun, making it more difficult for life on Earth to arise, or even to survive.

During the collision, Theia's mantle material evaporated, producing a large amount of gas, and flying away from the Earth with a large amount of shattered dust at great speed. The material that flies off the earth is composed of both the mantle material of Theia and a small amount of the material on the earth, with a ratio of roughly 0.85:0.15.

The metal core of the Theea star, which separated from the mantle at the time of Theia's rupture, was slowed down by the gas that expanded and flew away, and was accreted to Earth in about 4 hours.

The gas and dust that fly away from the Earth are not completely separated from the gravitational control of the Earth, and are combined by mutual accretion to form several separate small moons, and then gradually accretion to form a partially molten large moon.

The Moon gradually moved away from the Earth after its formation. In about billions of years, it may be out of the Earth's gravitational orbit. ”

"What? Will the moon break away from the earth in the future?"

"Yes, yes. ”

The solar system is centered on the Sun and is a collection of all celestial bodies that are subject to the Sun's gravitational constraints: 8 planets (in descending order from closest to the Sun): Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune. and at least 164 known moons, five identified dwarf planets (Pluto, Ceres, Eris, Haumea, and Orias) and hundreds of millions of small bodies in the solar system. These small bodies include asteroids, Kuiper Belt objects, comets, and interstellar dust.

Broadly speaking, the domain of the solar system includes the sun, 4 Earth-like planets, an asteroid belt of many small rocks, and 4 gas-filled Jupiter-like planets filled with frozen small rocks, known as the second small celestial region of the Kuiper belt. Beyond the Kuiper Belt there are the ecliptic discrete disk and heliosphere, and the Oort cloud.

The largest moons in the solar system (more than 3,000 km) include Earth's moon moon, Jupiter's moon Europa (Io), Europa (Europa), Ganymede (Ganymede), Ganymede (Callisto), and Saturn's moon Titan (Titan), as well as Neptune's captured moon Triton (Triton).

The protagonist of the solar system, the Sun, has 99.86% of the known mass in the solar system and dominates the solar system with gravity. Jupiter and Saturn, the two largest planets in the solar system, account for more than 90% of the remaining mass, and the Oort cloud (the 100 billion comet matrix that scientists imagine surrounds the solar system, but actually belongs to the primordial nebula, that is, the nebula matrix that gave rise to the solar system), it is not known how much mass it will occupy.

The orbits of the major celestial bodies in the solar system are in the vicinity of the plane of the Earth's orbit around the Sun (ecliptic). The planets are all very close to the ecliptic, and comets and Kuiper Belt objects usually have significant tilt angles.

A bird's-eye view of the solar system from the north downwards, all the planets and most other celestial bodies orbit the Sun in a counterclockwise (right-handed) direction. There are some exceptions, such as Halley's Comet.

The solar system is part of the Milky Way. The Milky Way is a barred spiral galaxy with a diameter of 100,000 light-years and more than 200 billion stars. The Sun is the most typical star of the Milky Way, located about 2.5-28,000 light-years from the center of the galaxy. The solar system moves at a speed of about 220 km/s and makes one revolution in 226 million years. Many galaxies, including the Solar System, revolve around a giant black hole at the center of the Milky Way. There are other extragalactic galaxies outside the Milky Way, and at the center of the universe is a giant black hole that attracts all galaxies to revolve around it.

I asked, "Sage, there is a huge black hole at the center of the universe now, will the universe be destroyed by black holes in the future like the previous universe?"

Sage: "Yes, everything is inseparable from the cycle of cause and effect. ”

I asked, "Ancestors, in this universe, are humans on Earth the only cosmic beings?"

"No, the universe is so vast that it is large enough to drown out all the samples of probability theory, so the probability that human beings on earth are the only beings in the universe is the lowest, unless, as theology says, human beings were created by God. ”

"Modern science has discovered that the relative position of the earth and the sun makes it just right for the development of life. Such coincidences are so rare in the universe that people can't help but believe that man is God's chosen favorite. So how can this phenomenon be explained scientifically?"

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