The fact that the two black holes in the core of the Andromeda Galaxy eventually merged into a larger black hole cannot be changed, and even Xiao Yu has no way to change this matter. This is an action between stars with hundreds of millions of times the mass of the sun, and Xiao Yu may be able to spend a long time and huge energy to destroy these two black holes, but he has no ability to prevent them from finally merging.

The collision of two stars will have a high probability of merging into a larger star, and in the process there will be an extremely violent burst of energy, and the collision of two white dwarfs, depending on the conditions, will form a heavier white dwarf, or explode, or form a neutron star, but in the process there will still be a huge burst of energy. As for the collision of two neutron stars, it is needless to say that the violent burst of energy from the collision of neutron stars is the most intense energy burst in the universe, one of the sources of gamma-ray bursts.

It stands to reason that two black holes colliding would have a more violent burst of energy, but this is not the case. The most important point is that black holes are only allowed to enter and not exit, except for the loss of mass and information through negative matter particles and information storms, black holes do not allow any other matter or energy to escape from their bodies. This means that the process of merging the two black holes with each other will be smooth, and they will merge into one with little energy or material loss.

The reason why I say "basically" rather than absolutely, is that in exceptional circumstances, there are still unexpected situations. Now, for example, the two black holes are surrounded by a large amount of matter.

The extreme gravitational pull of a black hole accelerates the matter revolving around itself to extremely high speeds, forming an accretion disk. In the process, enormous amounts of energy are ejected along the poles of the black hole, even millions of light-years away. This is one of the most spectacular sights in the universe, the jet of a black hole.

The fusion of these two black holes. Black holes do not lose any energy or mass on their own, but dust clouds that revolve around them at extremely high speeds are different, and in the process of collision, they collide at extremely high energy levels, bursting out with incomparably more intense energy, stronger than neutron star collisions, supernova explosions, etc.

At that time. The entire Andromeda core will brighten up to the point where it exceeds the brightness of the entire galaxy's stars. By that time, the Andromeda Galaxy will be many times brighter when viewed from the Milky Way. Even to the point where Jupiter can be seen from Earth in the age of Earth.

If the earth still exists, then at that time, the night sky of the earth will once again have a beautiful scenery.

This is the collision of river systems. Billions of years later, the collision of the Milky Way and the Andromeda Galaxy will recreate this scene. The difference. At that time, the energy that erupts from the core of the galaxy will be even stronger. After all, the black hole at the core of the Milky Way is much more massive than the smaller of the two.

"The collision of the river system will trigger a new wave of star birth, and at that time, the Milky Way-Andromeda galaxy will become a starburst galaxy, and the explosion of a large number of new stars will completely change the appearance of this new river system, but unfortunately, it will be tens of billions of years later." Xiao Yu thought silently. "At that time, I didn't know if existence existed. I don't know if I'll ever get a chance to see this scene. ”

Starburst galaxies are simply river systems with a large number of new stars, and the reason for this is that the collision of rivers will disturb a large number of gas dust clouds in the two river systems, and the gas dust clouds will condense and converge with each other, and new stars will be born.

Xiao Yu stayed at the heart of the Andromeda Galaxy for decades. In the past few decades, Xiao Yu has made detailed observations of various stars and gas flow data here, and further improved his theory of river system evolution.

If there were no special circumstances, Xiao Yu would have stayed here for a longer time, but an unexpected thing happened that broke Xiao Yu's plan.

Through the heavy interstellar gas, bright stars and distant barriers, Xiao Yu observed that at this moment, a supernova explosion occurred in the distant galaxy, and one of the poles of this supernova explosion happened to be facing Xiao Yu's current direction. As a result, in Xiao Yu's opinion, the brightness of this exploding supernova reached the brightness of the entire river system in an instant, as if a light suddenly lit up in a dark room.

Supernova explosions are a common occurrence, and although they only occur when regular stars die, thanks to the large number of stars, if you look carefully, you can always find several explosions a day in the universe. But there was something unusual about this supernova explosion.

After all, it was from his hometown, the changes in the stars in the galaxy, so Xiao Yu recorded all kinds of data of this supernova explosion in detail, and then seemed to be subconsciously, Xiao Yu compared the data of this supernova explosion with many supernova explosion data stored in his database.

Based on this comparison, the conclusion reached made Xiao Yu feel shocked. Xiao Yu reviewed the comparison results with some incredulity, but the final conclusion was still the same.

Xiao Yu's heart began to be confused. In this case, Xiao Yu didn't know if it was a coincidence, his own observation error, or ...... This is really happening in the Milky Way.

What Xiao Yu observed was a very ordinary supernova explosion, but in the sense of time, it was definitely not ordinary. When he was in the Milky Way, Xiao Yu had detected the remains of this supernova explosion and sent a probe to this place. That's when seen from Earth, in the direction of the constellation Leopard, about 9,000 light-years from Earth.

Yes, although Xiao Yu has just seen the light of this supernova explosion now, when Xiao Yu was still in the Milky Way, Xiao Yu had already arrived at the remains of this supernova explosion and explored.

This is a very incredible thing, this matter is not logical, but the data obtained by Xiao Yu's detection clearly tells Xiao Yu that the supernova explosion he observed this time is the one he has explored.

"What's going on?" Xiao Yu thought incredulously, "I've obviously explored its wreckage, why is it that here, I saw the image of its explosion again?" ”

In fact, according to the existing theory, it is not impossible for this situation to occur, mainly because of the impact of the emergence of faster-than-light travel technology. For example, when Xiao Yu was in the Milky Way, a supernova explosion occurred 100,000 years ago and left a wreckage, and Xiao Yu explored there - at this time, the light carrying this supernova explosion had advanced a distance of 100,000 light years, and at this time, Xiao Yu spent 2.4 million years to travel 2.5 million light years to reach the Andromeda Galaxy, so at this time, Xiao Yu will arrive at the same place with the light carrying the supernova explosion.

In this case, it will happen that Xiao Yu first explores the remains of the supernova explosion, and then sees the image of the supernova explosion. There is nothing surprising about this matter, but what Xiao Yu is experiencing now is not like this. The most important contradiction is that the supernova explosion that Xiao Yu saw was not right above the point in time.

Xiao Yu had made a very detailed observation of the wreckage, and concluded that the supernova explosion appeared five million years ago. In this way, the light carrying the supernova explosion would have reached the Andromeda Galaxy, and it would have calmed down if it was looked at in the Andromeda Galaxy, but now, in the Andromeda Galaxy, Xiao Yu saw this scene again.

This is an inexplicable contradiction. The possibility of two supernova explosions so similar is infinitely close to zero, but apart from this explanation, Xiao Yu really can't explain this event.

After observing the image of this supernova explosion, Xiao Yu paid more attention to the Milky Way. Gradually, more and more inexplicable events that shocked Xiao Yu were presented in front of Xiao Yu one by one.

Xiao Yu began to observe several benchmark stars and neutron stars in the Milky Way, and came to the conclusion that the positions of these stars at the moment were completely different from the positions he had calculated, and that they should have been in the positions he observed at this moment 2.5 million years ago, not now.

In the decades that followed, Xiao Yu observed more things that should only exist in history. For example, a few gamma-ray bursts, a few supernova explosions......

All of this is like history repeating itself, and it is like going back in time. Millions of light-years away, in that distant river system, something mysterious seems to be happening.

When Xiao Yu saw the existence of another planet, Xiao Yu knew that he had to go to the galaxy. This event was so weird that I had to figure out what was going on in the galaxy. Only after these things are clear, can you start your subsequent cosmic journey with peace of mind.

After all, it is his hometown, and if he doesn't figure out what happened there, Xiao Yu will never leave.

Xiao Yu saw the earth. That's right, the earth, which had been destroyed a long time ago, was once again in Xiao Yu's eyes at this moment, and at this moment it was orbiting the sun in an orbit that Xiao Yu was somewhat unfamiliar with. And the solar system that Xiao Yu saw was also very different from the position he should be in his calculations. (To be continued......)