advanced player in arc

Chapter 826 There Are "Guests" Arriving
Ever since Dong Chen hand-picked the asteroid belt to become the current earth civilization's sword-carrying guard, Xiao Xing... er, the small belt... no, it's the asteroid belt, and has started to exercise uninterruptedly and practice martial arts.

The purpose is to use one's own martial arts one day to protect the earth's civilization from being harmed by foreign civilizations, and to beat the foreign civilizations so that they dare not attack the earth's civilization.

Of course, it is definitely not the asteroid belt itself that can hit the enemy hard, and Dong Chen can't command them. Here we are talking about the "robots" on the asteroid belt.

The self-increasing value of intelligent mechanical equipment is quite fast, especially after receiving clear instructions and having the first manufacturing base, they can show amazing explosive power in the shortest time.

It has been almost half a year since the construction of the first manufacturing base last fall, and the asteroid belt is already quite busy, and many ships have already been manufactured.

Correspondingly, with the battleship, the reconnaissance equipment used to find the target has also been built, and the surrounding solar system can be seen strictly.

Human beings have many versions of the determination of the boundaries of the solar system, and each has its own views.

Historically, before astronomical telescopes discovered it, our knowledge of the boundary of the solar system could only reach Saturn, so Saturn's orbit was the boundary of the solar system at that time.

Then in 1781, humans discovered Uranus, and the boundary of the solar system expanded to the orbit of Uranus.

In 1846, Neptune was discovered again, and the boundary of the solar system was extended to the orbit of Neptune.

Later, humans discovered Pluto in 1930, and the boundary of the solar system was extended to the orbit of Pluto again.

As a result, Pluto was a miserable group, and after only a few decades of being a planet, it was kicked out of the ranks of planets.

At the end of the last century, as people continued to study the Kuiper belt beyond Pluto, the boundary of the solar system was extended to the edge of the Kuiper belt at 30 to 50 AU.

Afterwards, astronomers discovered many zodiacal discrete celestial bodies, and the boundaries of the solar system were further expanded.

In addition to using the orbits of the planets as the boundary of the solar system, there is another way of saying that the maximum range of action of the solar wind is the boundary of the solar system, that is, the heliopause.

Of course, don't get me wrong, this is a serious astronomical name.

Although I usually brag that I can be good at anything, but this is really not the case.

The space between the stars is not empty, but filled with particles of the cool interstellar medium, and the sun is constantly blowing out charged particles called the solar wind.

The so-called heliosphere is the largest range where the solar wind takes place.

When the high-speed solar wind particles meet the interstellar medium particles, they will be pushed away, and they will gradually slow down until they are unable to compete with the interstellar medium particles.

To put it figuratively, the heliosphere is like a bubble blown out by the solar wind. The inside of the heliosphere is full of solar wind particles, and outside it is the interstellar space dominated by interstellar medium particles.

The outermost boundary of the heliosphere is called the heliopause.

At this time, the boundary of the solar system has officially entered the distance of "hundred" astronomical units, because the distance between the heliopause and the sun is almost one hundred astronomical units.

Moreover, the shape of this heliopause is not a perfect sphere, but an egg shape, and the distance from it can reach hundreds of astronomical units.

When "Voyager 2013" passed through the heliopause in [-], many astronomers announced that "Voyager [-]" had flown out of the solar system.

But some other astronomers do not agree with this statement, because they think that the boundary of the solar system is farther away, that is, the Oort cloud.

This time, the edge of the solar system was directly extended to the distance of astronomical units in units of "ten thousand", and even officially entered the sequence of light-year distances.

The Oort cloud is a spherical cloud that supposedly surrounds the solar system, filled with many inactive comets, and is also the home of many comets that don't see their heads and tails.

Astronomers generally believe that the Oort cloud is the remnant of the nebula that formed the sun and its planets 50 billion years ago and surrounds the solar system.

It is about 50000 to 100000 astronomical units away from the sun, and its maximum radius is about 1 light-year.

That is, the radius reaches about a quarter of the distance from the sun to the nearest star, Proxima Centauri.

Calculated in this way, the solar system is about a sphere with a diameter of two light years. It is conceivable that the solar system is huge.

In addition to the Oort cloud, some scientists also regard the gravitational range of the sun as the final boundary of the solar system.

We know that the distance between the sun and the nearest star Proxima Centauri is 4.3 light-years, so the gravitational range of the sun's action will be at least half of this.

If calculated in this way, the radius of the solar system can reach two light years, which makes the solar system even bigger.

Then, if "Voyager [-]" wants to fly out of the solar system, it is estimated that it will take tens of thousands of years.

Of course, Dong Chen has no time to care about these debates in the astronomical world. He is the most practical, because the maximum warning range of the detection equipment he uses is a little more than one light-year, and a little more than one light-year in each of the four directions, so basically it is considered Keep a firm eye on the solar system.

But on the other hand, this point of light has already reached outside the solar system?

What exactly is it?
"...there are two possibilities, the unnatural possibility and the natural possibility, sir."

Having finished his meal, No. [-], who returned to the laboratory, introduced the situation to Dong Chen in detail.

"The first possibility is space flight equipment built by intelligent creatures, such as spacecraft."

"Judging from this light spot, they should only have one spaceship, but according to the ratio, this spaceship should not be small. It may be an interstellar mothership, and its firepower should not be underestimated."

"Without knowing their purpose, we'd better be prepared for defense, so that we won't lose the initiative in the first place."

"Well, defensive preparations are indeed made," Dong Chen repeatedly looked at the three comparison pictures and said, "Do you have any more specific data now? For example, what is its traveling speed?"

"It's not clear yet, sir. We only know that it is approaching the solar system. The specific speed needs to collect more data for effective calculation. At present, we only know that it has not reached or exceeded the speed of light." No. [-] said seriously.

"It didn't reach the speed of light..." Dong Chen knocked on the table in deep thought, and said with a frown, "Then this spaceship may not be as big as we imagined, and the reflected light point is just that they have spread out their light sails."

"Maybe it has two energy systems, one comes from the interior of the spacecraft, and the other comes from the absorption of external energy, and the speed has not exceeded the speed of light. If it looks like this, this guy may be a weak chicken."

"Yes, sir," said One, "that hypothesis is also in my plan."

"This is not a natural possibility, but what about a natural possibility?" Dong Chen asked again.

"Another possibility is that this bright spot may be a red dwarf or a brown dwarf."

"A...a large celestial body that appeared at the edge of the solar system? It might be a star." Dong Chen hurriedly asked, "How do you say it?"

"It's like this, sir, this possibility comes from a human hypothesis," explained Number One, "that is, the sun is not alone, but there is another companion star, and what we see now may that's it."

"You mean... Nemesis, the Nemesis?!"

(End of this chapter)