Humanity is missing, luckily I have billions of clones.

Chapter 99 Jupiter (Subscribe!!!)
Li Qingsong knew that bright nebulae were divided into emission nebulae and reflection nebulae according to their luminous types.

Emission nebulae are nebulae that emit light of their own, usually when the interstellar dust molecules they are made of are ionized by massive celestial bodies, releasing light of various colors.

For example, the Eagle Nebula has a very famous structure inside it, which is the Pillars of Creation.

Several huge pillars with lengths of tens of light years extend from this nebula. The gas clouds that make up these pillars collapse inward under the influence of external disturbances and their own gravity, and eventually condense into stars.

Dozens, perhaps even hundreds, of massive stars are gestating in this stellar nursery. The birth of these stars ionizes and heats the dust that makes up the nebula, releasing light.

Reflection nebulae are nebulae that do not emit light themselves but can reflect the light of nearby stars. For example, the Hag Nebula in Orion shines by reflecting the light of Rigel.

In addition, there is a more special type, which is the planetary nebula.

When a massive star reaches its final stage of evolution and a supernova explosion occurs, the materials that make up the star will be thrown into interstellar space by the violent explosion, leaving behind a dense star, a neutron star or a black hole in the center.

If it is a neutron star, because it has extremely high radiation, energy and magnetic field, it will "stir" the entire nebula, giving it the ability to emit light.

The most famous of these is the Crab Nebula.

This massive star, located about 6500 light-years from Earth, exploded around the Song Dynasty in Earth's time.

Although it was so far away, the light from its explosion was still so strong that it could be seen even during the day on Earth, and was clearly recorded by people at the time.

But none of these three models for what causes the nebula to glow seem to fit the current situation.

The first thing we can rule out about the nebula we observe at this moment is the possibility that it suddenly moved here from somewhere else.

Because it can't move that fast.

Since it didn't come from somewhere else, it could only have been there all along. And if it had always been there, yet I hadn't observed it before, then it could only have been a dark nebula.

There are three reasons why a dark nebula becomes a bright nebula: 1. ionization by its parent star; 2. reflection of light from a nearby star; 3. the presence of a dense celestial body inside.

But none of these three are possible.

Combined with the information previously obtained from the Bluetoke captives, only one possibility emerged in Li Qingsong's mind.

The Bluetuk migration fleet has arrived.

They were coming towards the solar system from the distant Gliese 625 galaxy. Halfway through their voyage, the fleet entered this dark nebula.

The high-speed ions ejected from the spacecraft's engine "stirred" the entire nebula, just like dense celestial bodies or proto-stars, giving them higher energy. As a result, they were originally just dark nebulae without the ability to emit light, but now began to emit light and were observed by themselves.

Li Qingsong had already known that the fleet of the Bluetuk civilization would arrive sooner or later. There was nothing strange or shocking about it.

The only thing that shocked Li Qingsong was that the high-speed plasma ejected by a spacecraft engine had extremely low energy compared to an entire nebula.

This nebula is not very large, only about 10 billion kilometers in size, which can probably cover the entire solar system.

Compared with those huge nebulae that are tens or hundreds of light years in size, it is undoubtedly a tiny thing.

But the problem is, this is only compared to other nebulae.

Compared to intelligent life, it's still unimaginably massive. A single spacecraft can only "light up" a tiny sliver of the nebula. To "light up" the entire nebula, how large would the fleet have to be?

At this moment, even if he used the largest-aperture and most technologically advanced telescope he could make at this stage, this nebula was still just a dim bright spot in Li Qingsong's eyes, unremarkable, and there seemed to be nothing worth noting.

But looking at this dim bright spot from afar, Li Qingsong seemed to see an endless array of gigantic spaceships, a vast number of aerospace carriers, heavy transport vessels, and powerful warships with the power to destroy the world...

The jet energy of a single spacecraft is limited, but when these countless spacecraft are combined, they can light up an entire nebula.

What a massive scale! From the Gliese 625 galaxy to the solar system, a distance of more than 20 light-years, what a magnificent migration!

compare to……

Li Qingsong looked at his migrating fleet.

The size of his own fleet was already large enough, but compared to the current migration of the Bluetuk people, it was like an ant dragging bread crumbs compared to a heavily loaded train.

Li Qingsong felt deeply his own insignificance, and because of his insignificance, he felt enormous pressure.

Just by taking a look at this moment, the surging pressure made Li Qingsong almost breathless.

I only have a little over two hundred years left. Will I have to face such a powerful enemy in two hundred years?
Can I really, truly defeat them?

Li Qingsong closed his eyes for a long time. When he opened them again, there was no more confusion, fear, or worry in his sight. Only calmness and determination remained.

He quietly gazed at the bright sun and whispered, "If I am the only one left in the solar system, then I will protect our homeland."

The huge fleet continued to advance rapidly, and the exploration of the starry sky continued without stopping for a moment.

Gradually, the fleet passed the orbit of Pluto.

But unfortunately, Pluto had moved to another place at this moment, and Li Qingsong did not see it.

At this point, it has not yet truly entered the inner solar system, because Pluto has long been expelled from the qualification of a major planet and downgraded to a dwarf planet.

The outermost large planet is Neptune.

Only when you cross the orbit of Neptune can you be considered to have truly entered the inner solar system.

It was another long voyage of more than ten billion kilometers. This time, at a distance of hundreds of millions of kilometers, Li Qingsong used a telescope to see the blue figure of Neptune like the sea.

After a journey that lasted several years, spanning a distance of more than 10 billion kilometers and hundreds of years, at this moment, Li Qingsong finally returned to the inner solar system.

The fleet's advance did not stop.

Apart from releasing some probes to Neptune, Li Qingsong did not make any stops.

His target was always clearly aimed at the largest planet in the entire solar system, Jupiter, in front of him.

(End of this chapter)