This thrilling, extraordinary and memorable story about space travel finally ended. But before we get to the real end, I'd like to share a few words with our beloved readers.

There are two main things that inspired me to create this work. One is those many technologies mentioned in the story, some of which may become reality in the near future, while some may not be so easy to see. But it doesn't matter, because we're always embracing a better life, and that's enough. The original intention of human developing science and technology is not to realize all wishes, but to use more technologies to make our life more colorful. I also sincerely hope that we will have a better life in the future, even if we will never reach the level of science and technology described in the story.

And the other, and most important, is those words that William wrote down:

Forge your lead with rock-like faith, and fill your fuel with fire-like struggle. Then you will become the most gorgeous fireworks, interpreting the meaning of life with dazzling light.

These words are like a perpetual motion machine that kept inspiring me to this day. It inspired me to study hard, to do many other activities, and to strive to define the meaning of my life for the next decades of my life.

Sometimes, I often think of the vastness of the universe and the smallness of human beings. However, I do not think that humans are small, because the universe, vast as it is, is not life -- at least we now have no proof that it is. While humans have their lives, and they are always trying to figure out how not to waste their lives.

For this question, my answer is that all the value of human life comes from struggle. Why infinite stars glow brightly in different colors is because they use nuclear fusion to burn up elements in their bodies, and release considerable amounts of energy. If they had not been able to carry out fusion, wouldn't they sleep quietly in the dark? Why the current life of human beings can be so convenient and developed is because there were countless ancestors sweating and working hard for the future. If we had not become the dyropithecus who stood up and developed by struggling, in which way would today's better life come?

But before we interpret the meaning of life, there's one more thing whose help is needed by us. As long as stars have enough temperature and pressure, they can take advantage of nuclear fusion. As long as we believe that our struggle can create the future, we can embrace the future. So, if you believe you can do it, just do it, just like a lead is able to ignite the fuel of a firework.

There are plenty of people who have successfully demonstrated just how great life really is, such as disabled people who participated in extreme sports, fighter pilots who defended their countries, and many, many others who were less well-known. But there is no one who did not rely on a firm belief to go through it all. To them, faith is like magic. They can get inexhaustible motivation from there to support their unremitting efforts.

Perhaps you will say, "I am just an ordinary person who is unknown to everyone. What can I achieve?" Don't feel inferior -- William didn't believe he would make it home at first, did he? What I really feel like telling you is that you can achieve a lot. You may not be able to travel into space in a spaceship, but at least you can climb the mountains and enjoy the starry sky. You may not be able to solve complex environmental problems quickly, but at least you can recycle. You may not be a top marathoner, but at least you can keep beating your own records. The incredible height of life come from countless small accumulations.

So go forge your lead. Go fill your fuel. The more reliable your lead is, and the more fuel you have, the higher you'll go into the night sky. Do not be stingy with the sweat, or afraid of the dangers ahead. That's easy for a person who wants to shine in his brightest light.

I sincerely hope that you will write wonderful chapters in the long river of life, and tell yourself with a smile at the end of your life, "I have lived a life higher than the highest mountain, deeper than the deepest ocean, brighter than the brightest star, and dearer than the dearest diamond." I wish that, in the endless darkness, I will see your brightest light, hear your loudest laugh, and feel your dearest joy -- the joy of life.

THE END