It was impossible for Kang Shengguo to be alarmist, and the only one present who was not shocked was Lin Han.

Lin Han is also a science student, and he is a science graduate student, so he should know all these things.

Zhang Zhi felt a headache, the universe is so big, only the unimaginable, everything is possible. If humans can be produced on Earth, why can't other planets?

Perhaps there were other intelligent life in the universe hundreds of millions of years ago, after all, the universe has been born for 13.8 billion years.

Human beings on earth have a limited understanding of the universe and have not yet broken out of the solar system. In 1977, the United States launched the Voyager 1 spacecraft. The spacecraft flew past Jupiter and Saturn, and then passed through the asteroid belt, reaching 17 kilometers per second, accelerated by the gravitational slingshot effect of Jupiter and Saturn.

In 2014, the National Aeronautics and Space Administration of the United States held a press conference, announcing that the "Voyager 1" probe launched 37 years ago had left the solar system and was flying to other stars.

But in fact, strictly speaking, Voyager 1 did not leave the solar system, but went to the outer Kuiper belt of the solar system. But the Kuiper Belt is not yet the boundary of the solar system, which also includes the Oort Nebula, which extends two light-years away. It was a zone filled with tiny Xiaoice objects that were remnants of the primordial solar nebula and the source of short-period comets.

Whether Voyager 1 will leave the solar system alive is still unknown.

That's all Zhang Zhi knows, this is a proposition that a high school student knows now. But thinking about it carefully, he thought that human science and technology were already very developed, but they couldn't even get out of the solar system, and to what extent did those intelligent beings who could enter the solar system reach?

Kang Shengguo said a lot, and Yan Weiguo pulled the topic to the issue of battle angels.

In the end, Yan Weiguo said that as long as Zhang Zhi was willing to come forward, he would help report back to the Central Military Region to see if he could organize a transnational operation, of course, if he wanted to gain something, it would depend on Zhang Zhi's own ability, and he did not mention Zhang Zhi's idea of handing over the battle angel to the military.

Zhang Zhi thought about it and agreed, he had never been exposed to these things in his previous life or this life, and he was very interested in what kind of dark energy transformation core he was.

The most important thing is that he is very confident in his own strength.

In the end, Zhang Zhi talked about Liu Shangyang, and what surprised him was that Yan Weiguo actually said that they didn't care about this matter, at least the Central Military Region, even if he killed Liu Shangyang, it was his ability.

Liu Shangyang didn't know that things would turn out like this, and the news came out, which made Zhang Zhi have a connection with the military, and the Shandao Group, because the time was too short, there was no reaction.

But as soon as Yan Weiguo left, Zhang Zhi did not let a few onlookers disperse, but asked Kang Shengguo: "Teacher Kang, where did the neutron star you mentioned just now come from?" Also, what is a black hole, you can solve the puzzle with us. ”

"Ah, that's complicated, we have to start with the stars, so let's start with the source. Not much else, let's start with the evolution of stars, stars, such as the sun, will expand into a red giant in old age, and their size will expand a lot, and their brightness will also increase. The state of the red giant does not last long, usually tens of thousands of years. After tens of thousands of years, small and medium-sized stars begin to unstabilize and explode, forming a very dense white dwarf star inside them, and all the external material explodes and separates into nebulae. ”

"If the white dwarf continues to burn, it will get colder, lose energy, and finally become a lifeless black dwarf that won't even shine anymore. But whether it is a white dwarf or a black dwarf, they are all atomic structures, and no matter how dense they are, they have not reached a terrifying state. ”

Speaking of this, Zhang Zhi looked up at the sun and said, "The sun is still young, we don't have to worry about it." ”

"The sun has a lifespan of 10 billion years, and now it is less than 4.6 billion years, which is very early. Okay, I'm going to talk about neutron stars now. A star that is 1.44 times larger than the Sun and has more than eight times the mass of the Sun after becoming a red giant star will evolve to a later stage, then the path will be different, because of the huge gravitational force, after the explosion, the matter will not be thrown away, but will be attracted back by its own gravity. The huge gravitational force and the pressure formed by many substances will make the material of the entire star unable to maintain the atomic state, and will be directly compressed, and the electrons will no longer be free from the nucleus, but directly compressed into the nucleus, and the entire planet will shrink hundreds of billions of times in an instant. The main mass of the nucleus is neutrons, and the electrons are gone, so you can understand why the final planet is called a neutron star. ”

Liu Canmei nodded and said, "This is understandable, neutron stars are all composed of neutrons." ”

The others also nodded, but Kang Shengguo shook his head and said, "It's not, it's just that the others are negligible." Let's move on, there are even bigger stars. As you know, the main component of neutrons is quarks, and what happens if the star is huge enough and under more pressure that it can't even maintain its neutron state after it collapses? It will continue to collapse and eventually become a quark star. This quark star is denser than a neutron star. Neutron stars have a mass of 800 billion to 2 billion tons per cubic centimeter, the size of a small thumb, and quark stars are even more exaggerated. ”

"Horror!" Zhang Zhi fantasized about the starry sky and thought it was incredible.

"What could be more terrifying! Head! When the star is more huge, after the explosion, the neutron state and quark state can not be maintained, it will continue to collapse, it can be compressed to infinitesimal size, but his mass is still there, so the entire star matter will be compressed into a point with zero volume but super mass, called a singularity, which is a black hole. Needless to say, how terrifying this black hole is, although the neutron star and quark star are powerful, the light can still escape, but on its surface, the light has become arc-shaped, but within a certain range of the black hole, even the photons are directly sucked away by his huge gravity. ”

"Well, when you say this, my thinking seems to be much clearer, and it suddenly becomes clearer, it seems that people still need to read more." Zhang Zhi couldn't help but sigh.

Zhang Zhi suddenly remembered something, so he asked again: "By the way, Mr. Kang, do you think there is a spaceship that can reach or even exceed the speed of light and fly directly into the solar system from other galaxies?" ”

"Impossible!" Kang Shengguo said directly and affirmatively.

But in a blink of an eye, he said: "However, there are often people in the scientific community who publish papers that have detected dark matter particles moving faster than the speed of light in the laboratory, and this dark matter field is something that our earth science and technology cannot understand at present." At present, we have determined that the speed of superluminal motion is only the speed of expansion of the universe that exceeds the speed of light, and as for the spacecraft that wants to operate faster than the speed of light, some people have proposed curved phase propulsion. Curvy propulsion refers to the bending of space-time in a specific way, causing objects to move faster than the speed of light. The curvature of space-time allows objects to travel faster than the speed of light while remaining on a time-like world line. Like the wormhole theory, curvature propulsion requires strange matter with negative energy density. Even if such substances exist, it is not clear how they should be arranged to achieve the curved phase advancement. Of course, if we are given tens of thousands of years or hundreds of thousands of years, it may be possible. ”

When Zhang Zhi heard this, he already had a general understanding of the scientific and technological level of the earth, which was the primary civilization that had not yet broken out of the solar system.

It is generally believed that the solar system has a radius of two light years according to its influence, that is, it takes two years for light to emit from the sun to leave the solar system.

"You're not easy! Can do this! Zhang Zhi looked up at the sky and thought to himself.

(End of chapter)