Since it was decided that scientific research would not be abandoned during the voyage, and that 1 billion clones would remain conscious, there was one matter that had to be considered.
Tom had to create an environment suitable for human survival as much as possible. Otherwise, the clones' work efficiency would not only be affected, but they might also get sick, injured, enter a state of aging prematurely, or even die.
Replenishing clones on a large scale in deep space is not easy.
Regarding the life-support environment, air, temperature, and atmospheric pressure are, of course, self-evident and essential. But there is also one most important aspect: gravity.
Within the solar system, every planet has its own gravity. Although it may be large or small, it is always there. And the human body is more suitable for living in an environment with a certain amount of gravity.
