After signing the treaty, Zhu Lei and his fleet began to fly to the home star of the Kara civilization, because the home planet of the Kara civilization is still a little far away, after all, Zhu Lei's fleet is still outside the skin of the Kara galaxy, so after more than a month of sailing, the fleet led by Zhu Lei finally arrived at the location of the home star of the Kara civilization.

The home planet of the Kara civilization is much larger than the earth, equivalent to the size of three earths, and its land occupies at least more than 50% of the surface area of the planet, so in general, the home planet where the kara civilization is located, the land area is more than twice that of the earth, but the gravity of this planet is comparable to that of the earth, and the gravity of the planet kara is 1.1 times that of the earth, which is very suitable for human beings to survive on it.

Although the Kara civilization is a scientific and technological civilization, but because the total population is not very large, only billions, so the environmental protection of this planet is basically good, and it has not caused man-made damage above, so the forest coverage area on this planet is quite large, and from space, the desert Gobi and so on are basically not visible.

There are a total of five continents on the planet Kara, and although the intelligent life of the Kara civilization has traces of activity on five of the continents, the main activity area of the Kara civilization is only one of the continents, and one of the other four continents is located at the south pole of the planet, covered with a thick layer of ice, and the temperature is above minus 30 degrees all year round, so except for a few scientific research activities, there is no intelligent life of the Kara civilization living on it.

This is the intelligent life of the Kara civilization, the lizardman. Due to the structure of their bodies, when the temperature is lower than 10 degrees, they will be stiff and difficult to move like snakes on earth. When the temperature reaches 5 degrees, their body protection mechanism will force them into hibernation, and the lizardmen of the Kara civilization will not enter the area where the temperature is less than 10 degrees.

And the home star of the Kara civilization is not like the earth, which orbits the stars in their galaxy, but unlike the earth, the home star of the kara civilization orbits around their star very closely, so the fourth-level change of the home star of the kara civilization is very weak, and it is not even felt at all, so this planet has a lot less species of organisms than the earth. And most of them live in warmer places, while there are basically very few creatures living at the poles.

Although the Kara civilization has a population of billions, there is no pressure at all on such a large planet, or even nothing, after all, the planet is larger and can produce more creatures.

When Zhu Lei and the others arrived at the home planet of the Kara civilization, the first thing they did was to analyze the biological atmosphere on this planet, and they did not rush into this planet immediately.

This is because human beings do not know anything about the planet Kara, especially the various environments on it, including the atmosphere and organisms, etc., especially the knowledge of the creatures on the planet Kara, which is very important to humans.

And even if these soldiers in the human fleet have strong resistance to various viruses in the Kara civilization, don't forget that all the creatures in the Kara civilization are ordinary life, including the intelligent life lizardmen on the planet Kara are ordinary life, and each individual of the human race carries countless various viruses, many of which are a great threat to life, although these viruses are no longer harmful to humans.

After all, in hundreds of thousands of years of human beings, human beings have developed strong resistance to these viruses, and the human immune system is enough to kill these viruses, but the Kara civilization is different on their home planet, so the resistance of these creatures to these viruses is basically zero.

For example, Carl, the interstellar diplomat of the Kara civilization who had the earliest contact with humans, is now lying weakly in the medical room of the human spaceship, undergoing treatment, and has been sick for three weeks, and the main culprit of Carl's illness is the cold virus.

Fortunately, because Carl did not leave the human mothership in a hurry, the cold is only a minor illness for humans, although these viruses have mutated several times after entering Carl's body, but due to the human understanding of the cold virus, Carl was quickly cured, although the process took three weeks.

And during the period when the human fleet went to the home planet of the Kara civilization, the queen and the high-level officials of the Kara civilization also had the same symptoms, although they were cured by humans at the beginning of the disease, but if the humans did not think of a way to enter the home planet of the Kara civilization, or the virus returned to the planet Kara within the incubation period, then the fate of various creatures on the planet of the Kara civilization can be imagined.

Although the soldiers on the human fleet this time are all congenital or above, they basically have a strong resistance to the general virus, but it is not invulnerable, if you don't understand these and rush into the Kara star, then it is an irresponsible behavior for both the human race and the intelligent civilization of the Kara civilization.

Therefore, for these threats, humanity must be solved before entering the home planet of the Kara civilization, otherwise it will not be beneficial to mankind and the Kara civilization, and may even directly lead to the demise of the Kara civilization.

Zhu Lei not only has military warships in their fleet, but also has a variety of scientific research spaceships, although human beings do not have much chance of winning the victory or defeat of this war at the beginning, but at the time of departure, the fleet was still equipped with a variety of scientific research spaceships, and among them, there are spaceships that can conduct research in this area, not to mention, if the scientific research spacecraft in the fleet is not enough, they can also contact the earth through neutrino communication, so that the earth can carry out long-distance support.

Finally, after the joint efforts of the scientists of the human fleet and the scientists of the Kara civilization, the human race finally solved the biological problem and planted the vaccine in the human body for all the people of the Kara civilization.

That is to say, from now on, all the people of the Kara civilization have the same virus resistance as humans, and because humans and the Kara civilization themselves are different races, after the research of scientists of the two races, they found that most of the viruses on the human body have no effect on most of the planet Kara, and even some viruses are harmful to humans, but they are very beneficial to the creatures on the planet Kara.

After more than two years on the home planet of the Kara civilization, Zhu Lei and the human fleet finally set foot on the home planet of the Kara civilization.