Their Sanctuary

In 2400 AD, humankind's exploration of the universe had made much progress compared with the early 21st century, but it was still far from being able to live in outer space for a long time. In fact, the technology is relatively complete, but the world economy is not as good as expected. It is funding problems that have caused the entire space immigration plan to run aground. People would rather spend money on cooler three-dimensional movies than care about how to immigrate to the cold and empty space. In fact, it's not that everyone doesn't care, because it's too hot on the ground, right?