Chapter 826 A “guest” has arrived

Ever since Dong Chen appointed the asteroid belt to become the sword-carrying guard of the current earth civilization, Xiaoxing... er, Xiaodai... no, it was the asteroid belt, and he began to exercise non-stop and practice martial arts.

The purpose is to one day use his martial arts to protect the earth's civilization from being harmed by foreign civilization, and to beat the foreign civilization so that it will no longer dare to take advantage of the earth's civilization.

Of course, it is definitely not the asteroid belt itself that can hit the enemy hard, and Dong Chen cannot command them. What we are talking about here is the "robots" in the asteroid belt.

Intelligent mechanical equipment's self-increase in value is quite fast, especially after receiving clear instructions and establishing the first manufacturing base, they can show amazing explosive power in the shortest time.

Almost half a year has passed since the construction of the first manufacturing base began last fall. The asteroid belt has been quite busy, and many ships have been manufactured.

Correspondingly, with the battleships, reconnaissance equipment used to find targets was also built, and the surroundings of the solar system were carefully observed.

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

Historically, before the discovery of astronomical telescopes, our understanding of the boundaries of the solar system could only reach Saturn, so at that time, the orbit of Saturn was the boundary of the solar system.

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

In 1846, Neptune was discovered again, and the boundaries of the solar system expanded to the orbit of Neptune.

Later, in 1930, humans discovered Pluto, and the boundaries of the solar system were once again expanded to the orbit of Pluto.

As a result, Pluto was among the worst. It had only been a planet for a few decades and 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 boundaries of the solar system were expanded to the edge of the Kuiper belt, which is 30 to 50 astronomical units.

Later, astronomers discovered many zodiacal discrete objects, and the boundaries of the solar system were further expanded.

In addition to using the orbits of the planets as the boundaries of the solar system, there is another way of saying that the maximum range of the solar wind is used as the boundary of the solar system, which is the heliosphere.

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

Although I usually brag about being able to survive in anything, I can't really survive this time.

The space between stars is not empty, but is filled with low-temperature interstellar medium particles. The sun will continuously blow out charged particles called solar wind.

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

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

To put it figuratively, the heliosphere is like a bubble blown outward by the solar wind. The heliosphere is filled with 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.

By 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 the heliosphere is not a perfect sphere, but an egg shape, which can reach several hundred astronomical units at a relatively far distance.

When Voyager 1 passed through the heliosphere in 2013, many astronomers announced that Voyager 1 had flown out of the solar system.

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

At this time, the edge of the solar system was directly extended to the astronomical unit distance of "ten thousand", and even officially entered the light-year distance sequence.

The Oort cloud is a spherical cloud that is hypothesized to surround the solar system. It is filled with many inactive comets and is also the home of many comets that have never seen their beginning or end.

Astronomers generally believe that the Oort cloud is the remnant of the nebula that formed the sun and its planets 5 billion years ago and surrounds the solar system.

It is about 50,000 to 100,000 astronomical units from the sun, and its maximum radius is about 1 light-year.

In other words, the radius reaches about a quarter of the distance between the Sun and the nearest star Proxima Centauri.

If calculated this way, the solar system is approximately 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 sun's gravitational range 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 will be at least half that.

Calculating this way, the radius of the solar system can reach two light years, which makes the solar system even larger.

So if Voyager 1 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 community. He is 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 it is basically considered Keep a close eye on the solar system.

But on the other hand, this light point has reached the outer reaches of the solar system?

What exactly is it?

"...There are two possibilities, unnatural possibility and natural possibility, sir."

After finishing his meal, No. 1 returned to the laboratory and introduced the situation to Dong Chen in detail.

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

"From this point of light, they should only have one spaceship coming. However, according to the proportion, this spaceship should be not small. It may be an interstellar carrier coming over, and its firepower should not be underestimated."

"Without understanding their intentions, we'd better be prepared for defense, so that we don't lose the initiative immediately."

"Well, defense preparations have indeed been made," Dong Chen repeatedly looked at the three comparison pictures and said, "Do you have 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 does not reach or exceed the speed of light." No. 1 said seriously.

"It has not reached the speed of light..." Dong Chen knocked on the table in a deep voice and said with a frown, "Then this spaceship may not be as big as we thought, and this reflected light spot is just their unfolded light sail."

"Maybe it has two energy systems, one from inside the spacecraft, and one from external energy. In addition, the speed does not exceed the speed of light. If it looks like this, this guy may be a weakling."

"Yes, sir," said No. 1, "that hypothesis is also in my plan."

"This is unnaturally possible, but what about natural possibility?" Dong Chen asked again.

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

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

"That's right, sir, this possibility comes from a human hypothesis," No. 1 explained, "That is, the sun is not alone, but has another companion star, and what we see now may that's it."

"You mean... Nemesis, the goddess of revenge?!"