Nana Hoshino was completely attracted, and after thinking about the grand occasion of the alien ruins for a while, she immediately urged, "Uncle Ito, please speak quickly!"

Ito Taisho nodded repeatedly, lifted his glasses and said, "Where should this start? Miss, the solar system was not what we observe now at the beginning of its finalization, there are almost no asteroids, comets, and moons, do you understand?"

Nana Hoshino nodded and said, "I understand, Uncle Ito!"

Naoto Yoshihara sighed, his uncle, I can't understand it - this unlucky world, can't you even listen to stories if you don't have culture?

Nana Hoshino glanced at him and whispered, "In the eighteenth century, three scholars, Emmanuel, Emanuel and Pierre, proposed the 'nebula hypothesis', which is currently the mainstream academic hypothesis about the formation of the solar system. The nebula hypothesis asserts that the solar system was formed by the gravitational collapse of a massive molecular cloud spanning several light-years – a massive molecular cloud that somewhat resembles the current Orion Nebula, a region where stars were born. ”

"During the long collapse process, because of the conservation of angular momentum, the nebula rotates faster and slowly condenses, and the atoms in it collide more frequently, converting their kinetic energy into heat energy, making the central mass concentration hotter and hotter. After a long period of time, under the balance of gravity, gas pressure, magnetism, moment of inertia, thermal energy, etc., the shrinking nebula flattened into a primitive astrolabe with a diameter of about 200 astronomical units, and formed a thermally dense protostar in the center, that is, a star whose internal hydrogen fusion has not yet begun - this stage is considered to be the current state of Taurus T star. ”

"Later, the matter in the primordial astrolabe basically evolved into the sun, which accounts for 99.8 percent of the total mass of the solar system...... You don't have to use this expression, I remember correctly, the sun is almost the whole of the solar system. The rest of the 'dust' aggregates with each other during the formation of the sun, like a snowball, from dust particles to lumps, and then slowly forms microplanets, increasing in diameter by a few centimeters per year, and the larger the mass, the faster it increases, revolving around the protostar in a plane, until the fusion explosion within the protostar becomes a star, setting off a strong solar wind to blow away all the sharp and gas in the protostard, thus ending the planet's growth period. ”

Nana Hoshino judged Naoto Yoshiwara's expression, trying to figure out if he understood, "So the solar system was clean at the beginning, with only stars and planets, and almost nothing else! If it does not become a planet, then it lacks mass, and strong solar winds will blow it out of the solar system, forming the outer shell of the solar system...... Do you understand?"

Naoto Yoshiwara nodded vigorously and said with a smile: "Make do!" He cursed in his heart, "What is the conservation of angular momentum? What is the collapse of the nebula? This thing can only be understood! Is there a shell in the solar system? Is it an egg? I haven't heard anyone say it!"

Nana Hoshino looked at him with pity and patted him gently on the back - this stupid dog should not have understood, and sure enough, he didn't care about him, he didn't have common sense, so he blamed the poor man.

Ito Taisho glanced at Nana Hoshino strangely, he didn't quite understand how the relationship between the two people was so close, and the two of them hadn't known each other for too long, right? He was very cultivated, and waited for Nana Hoshino to finish explaining before continuing: "The original structure of the solar system was very simple, but about 65 million years ago, a planet with a diameter of about 18,000 kilometers broke into the ...... of the solar system at a high speed of more than 30 kilometers per second along the rotation plane of the solar system. ”

Nana Hoshino listened intently and asked, "Where did this planet come from, and why was it thrown out by the original galaxy?"

"It's impossible to trace, the Mayans haven't figured out where the planet came from, and the quantum computer in the ruins has only recorded the catastrophe. ”

"Uncle Ito, please continue. ”

"Neptune had just passed by when the alien planet entered Neptune's orbit – and if the two had collided at that time, there would have been no later events. Neptune passed by the alien planet, but under the interaction of gravity, Neptune was pulled away from its original orbit and slowly advanced nearly ten astronomical units into the interior of the solar system for a long time, and the orbital speed was greatly increased, and the alien planet was also changed its flight trajectory and folded towards the center of the solar system. Then the alien planet passed through the orbit of Uranus, but Uranus had been flying by for more than 30 years......"

Nana Hoshino explained to Naoto Yoshiwara in a whisper, "Uranus's orbital cycle is eighty-four years and four months, that is, you stay on Uranus for one year, and you spend more than eighty-four years on Earth. ”

Naoto Yoshiwara didn't say a word, only listened to Ito Taisho continue: "Then the alien planets went all the way unhindered, passing through the orbits of Saturn and Jupiter one after another, but at that time Saturn and Jupiter had already turned to the other side of the sun - this was the misfortune of the Mayans, their last barrier was not able to protect them, and finally the alien planets collided head-on with the Mayan planets - a small and almost impossible chance, but it happened. ”

Ito Taisho was silent for a while, as if he was thinking about the tragic scene of the collision of the two stars, and said: "The collision of the two planets is only the first step in this disaster, the Mayan star and the alien planet almost died together, and both sides collapsed into countless large and small debris, spinning at high speed and sweeping the entire solar system. ”

"Saturn and Jupiter have slowly captured a large number of debris due to their huge gravitational pull, and each has dozens of moons one after another...... Based on our observations alone, these satellites can find many abnormal places, such as Enceladus, which is almost split in half, Enceladus has plains and broken half-sections of mountains, and water surges can be observed, Enceladus has a large crack about 800 kilometers long, Enceladus 556 has all kinds of strange appearances, and even Enceladus is not round, it is angular and angular, like a piece of gravel. Jupiter's captured moons are in a similar situation, and even have four strange retrograde moons! Saturn's rings are a belt of ice, gravel, and dust more than 30 kilometers thick and more than 10 times wider than Saturn's radius, which is also the explosive wreckage of a double star attracted by Saturn. The same goes for Jupiter's rings – these two gravitational giants absorb the vast majority of the damage from the binary explosions, in a sense, they saved the planet. ”

Nana Hoshino nodded silently.

Taisho Ito continued, "Although Saturn and Jupiter are used as barriers, there are still some debris flying towards the inner and outer solar systems. The cores of the alien planets were pushed away by the reaction force of the explosion and impact of the double star and fell near the orbit of Uranus. A few decades later, Uranus caught up and swallowed it up in orbit, which also caused a huge change in the mass of Uranus itself, and the orbit began to slowly move forward, while the axis of rotation was seriously tilted, becoming the only planet in the solar system that 'lays' in orbit. ”

"Neptune is far away, only a dozen moons have been captured, and there is little ice and dust captured, forming a very thin and dim starfish ring, but one of the retrograde satellites has a diameter of more than 2,700 kilometers, ranking first in mass among satellites. ”

"After the explosion of the binary star, the wreckage left in the original orbit of Maya Star became an asteroid belt headed by Ceres and Marry, and most of the debris flying along the rotation plane of the solar system was captured by the gravitational field of each planet, and those that flew away in other directions had different fates, some became comets that returned once in decades, hundreds of years, and thousands of years, and some became binary multi-star systems, which were thrown into the distant outer solar system, such as Pluto, Charon, one with a diameter of more than 2,000 kilometers and the other with a diameter of more than 1,000 kilometers, forms an interdependent binary star system, located on the outer part of the solar system, and was once mistaken for a large planet...... However, because it is too small, it has now been disqualified as a large planet. ”

Nana Hoshino was stunned and asked, "If you want to say that, what about the star core of Maya? Where did the highest quality part go...... It won't be ......"

Taisho Ito nodded and said, "It fell near the Earth's orbit, but fortunately, it has become a binary star system with our Earth, revolving around the Sun together - the star core is very hot, it can be said to be a high-quality and dense magma, which has returned to a spherical shape after a long period of cold movement." ”

Nana Hoshino muttered, "I see, I've always wondered why the Earth has such a large moon, and no similar phenomenon has been found in any astronomical observations so far. ”

Naoto Yoshihara also asked a little strangely: "The Mayan star people should not have a low level of technology, why didn't they destroy that alien planet?

Ito Taisho glanced at him, shook his head and said: "We often talk about destroying the earth, in fact, we mean the destruction of mankind, even if all the nuclear bombs on the earth are detonated at the same time, human beings may perish, but the earth still exists, and it is not so easy to destroy a planet - the same reason, the Mayans are indeed ahead of us in terms of technology, but they are also at a slightly higher level than us in general." Due to the different processes of civilization development, they are much stronger than us in some aspects, and even inferior to us in some aspects. However, if they go one step further, they may start the era of colonization of the solar system and enter another prosperous period of civilization, but unfortunately the alien planet has ruined all this!"

Nana Hoshino pinched Naoto Yoshiwara's waist and told him not to ask stupid questions! At speeds of more than 30 kilometers per second and massive mass, you just fly up and drill a hole and blow it apart, and those fragments will also shatter Maya! If you want to change its trajectory - it's not a leather ball, how much strength do you need to make it change direction?

She asked, "Did the Mayans forcibly carry out interstellar immigration?"

Taimasa Ito nodded and said, "That's true, at that time, the Mayans united and began to migrate to Mars and Earth...... They themselves had this kind of plan, and they couldn't do it when they left the solar system, but at that time there were all kinds of research stations on Mars and Earth, just like our current Arctic and Antarctic research stations! It's just that the movement between planets was a huge burden even for the Mayans at that time, and they could only do their best to transfer, but unfortunately they failed in the end. ”

Nana Hoshino raised her little face, thought for a while and said, "Was there life on Mars at that time?"

Taisho Ito agreed: "Yes, according to the information provided by the quantum core computer, at that time, the Mayans had determined that there was life on Mars and Earth, but there was no sign of civilization, and Venus also had a certain living environment and was in the era of thermophilic bacteria." ”

Nana Hoshino squinted and said, "Judging from our current situation, the earth has not been devastated...... At that time, the earth was the age of dinosaurs, and the dinosaurs were extinct in that disaster, but the living environment did not deteriorate to the point that they could not hold on, and the Mayan planet was right to flee to the earth! After all, Mars is close to the Mayan planet, and it is extremely likely to be affected by the explosion, and it is not safe. ”

Ito Taimasa lifted his glasses and said: "Indeed, Mars has been attacked by a large number of meteorites, the temperature of the entire Mars has increased rapidly, and most of the gases have combined with other substances, such as forming a large amount of red iron oxide, and the surface of Mars is red! Mars has also captured two very small moons, but the atmosphere has been completely destroyed, and the basic environment for life has been lost...... The Mayans who fled to Mars should have survived. ”

"What about this side of the Earth?"

"The earth is relatively lucky, Mars has borne most of the debris that flew to the inner solar system, although the earth has also been hit by meteorites continuously, the earth's crust shaking has caused large-scale volcanic eruptions, global tsunamis and other giant natural disasters, there has been a large-scale extinction of life, but the atmosphere has finally been saved, and there is a chance to start over. ”

Nana Hoshino pondered intently: "Then why didn't the Mayans build another civilization on the earth? Even if the volcanic ash blocked the sunlight and the earth entered the glacial period, with the support of advanced technology, it should be no problem to persist for a few years or even decades, right?"