Voyage of the Stars.

Chapter 709: Journey to Immortal
As time went by, humans set sail and then stopped to resupply, and then continued sailing after completing the resupply. Gradually, humans finally discovered that the distance between the stars ahead was getting smaller and smaller, and the density of the stars was getting larger and larger. Seeing this, everyone realized that human civilization was about to truly step into the main category of the Perseus Arm.

Even the shortest route between the two arms is nearly 5,000 light years away. Due to the need for supplies, humans cannot travel in a straight line. Adding the time for supplies, the time spent on the journey is actually more than 500 years.

After arriving at the main body of the Perseus Arm, humans cannot stop and must continue along the originally planned route. It will take about two thousand light years to reach the real star field in the star map.

During the hundreds of years spanning the spiral arms, humans have not only been traveling, but also have never stopped scientific research activities and academic research. However, because large-scale scientific experiments are not suitable during warp speed, research progress in many disciplines is not great.

But even so, time has allowed humans to consolidate the scientific and technological achievements that led to the fourth-level civilization. For example, in the field of gravity potential well technology, humans have carried out several rounds of iterations, and the results of technological iterations have also been updated to human creations. The equipment in the floor of the Lyra has undergone a round of updates.

Finally, after completing a certain voyage, humans truly set foot on the Perseus Arm, a vast spiral arm filled with stars.

Humanity has accomplished the feat of trans-spiral arm navigation, which is undoubtedly something that will go down in human history. The member civilizations of the Star Alliance also feel extremely proud of this because they also personally participated in this great voyage.

There are four major spiral arms in the Milky Way, the Perseus Arm is one of them, and the Orion Arm is just a small branch arm of the Sagittarius-Carina Arm.

As a large spiral arm, the Perseus Arm naturally has more stars than the Orion Arm. A larger number of stars means a greater probability of the birth of civilization, and mankind has now come to a wider place.

Judging from the star map, the point where humans cross from the Orion Arm to the Perseus Arm belongs to the second half of the Perseus Arm. Towards the galactic center is the Orion Arm, then the Sagittarius-Carina Arm, the Cross Arm, further inward is the Rhombus Arm and then the galactic nucleus of the Milky Way. The star density there is very high, and it can be said to be a gathering of stars, but the environment is also relatively harsh.

From where we are, after crossing the Perseus Arm, we reach the end of the Rhombohedral Arm, and beyond that is the vast void. If we have the ability to sail far, we can go outward and leave the Milky Way. After the end of the Rhombohedral Arm, there is actually a spiral arm formed by the gathering of stars. From the observational data, it is an extension of the end of the Rhombohedral Arm, but humans call it the Outer Arm.

The outer spiral arm extends across most of the outer edge of the Milky Way, and is more than 100,000 light-years long from beginning to end. It belongs to the sparse star-filled star region outside the Milky Way's galactic disk. This area can also be called the outer edge of the Milky Way. The stars here are usually not counted in the diameter of the Milky Way because it is too sparse. From a human perspective, it seems as if it is shrouded in a vast nebula, giving a feeling of mist and thick clouds.

Therefore, if the extended area of ​​the outer spiral arms is also taken into account, the diameter of the Milky Way is actually more than 100,000 light years.

It is based on the observation of the outer extended spiral arm star field that humans have discovered that the rotation speeds inside and outside the Milky Way are not the same. This provides indirect evidence of the invisible and intangible dark matter. It can be said that the outer extended spiral arm star field has been of great help to the development of human scientific theories.

Unfortunately, humans currently have no ability to travel to the extended star field of the outer arm, because the span of the void space between it and the Milky Way disk is too large, and it is impossible for a Level 4 civilization to reach it. The span of the void is on the scale of 10,000 light years, and only Level 5 and 6 civilizations are capable of going there. From the Milky Way star map drawn after many years of observation, if you want to go to the extended star field of the outer arm, the shortest route is to go from the end of the Perseus spiral arm.

The Milky Way is so vast that it can accommodate countless civilizations and give birth to countless civilizations. At the same time, it can also cover up the traces of most civilizations. In the eyes of many civilizations, the Milky Way is a lonely place without any trace of civilization. The vast scale hides everything. At the same time, the vast scale also protects the birth of one primitive civilization after another and the growth of one low-level civilization after another.

Human beings are one of the lucky ones. Although they encountered an unexpected disaster on the eve of reaching the first-level civilization, they were protected by the vast galaxy and the unknown civilization that destroyed the solar system did not discover humans. Human beings thus had the opportunity to escape and thrive.

The vast galaxy is like a double-edged sword. It is not only the biggest obstacle to communication between civilizations, but also a natural barrier to protect weak civilizations.

It’s just like humans today. If we don’t personally send out probes to explore each planet in the target star system, we will not be able to discover whether there is an intelligent civilization inside a star on an interstellar scale.

Perhaps this is one of the reasons why humans have traveled thousands of light years from the Orion Arm to the Perseus Arm, but have not discovered other civilizations. Perhaps a civilization is in a nearby star on the human route, but we have not discovered each other.

It would be better if nothing was discovered. Human beings are now focused on reaching the small universe left by the pioneers, and naturally do not want to create any unnecessary trouble. Therefore, when arranging for the member civilizations of the Star Alliance to explore the safety of the route, they did not let them go to the star system outside the route.

Just like that, after humans arrived at the Perseus Arm, there was not much time left. After completing the supply, they continued on the last two thousand light-years of star journey, heading directly for the location shown on the star map.

This is the last stroke of the "匚" route. After completing this journey, you will reach your destination.

There is no difference between sailing in the Perseus Arm and sailing in the Orion Arm. They both sail at warp speed, replenish supplies to make antimatter fuel, and then continue on. During this long journey, because no alien civilizations were encountered, humans also spent a rare leisure time.

When they arrived in the new star field, for the sake of safety and the secrecy of their route, humans did not use star destroyers to blow up planets for mining as they did when they sailed in the Orion Arm. After all, that would be too conspicuous. If other civilizations discovered traces of the planet bombing, they could easily follow the clues to find the human route and thus the destination of this trip.

Therefore, after leaving the star system where the two satellites were blown up by the unknown civilization, humans have been using traditional mining methods to reduce the probability of exposing their route.

Hiding oneself has become one of the means for human survival. Even after reaching the fourth level of civilization, humans still have not forgotten to be cautious.

(End of this chapter)