The rules of the Netherworld were obviously different from the Qing Xuan star and the Earth. The Netherworld, in the view of the sky, was like the dome, covering the vast fields. In the other hand, Qing Xuan star and the Earth were a spiritual body in the void universe.
The stars from the sky were not stellar but were spirits. Of them, the Sun and the Moon were the most mysterious and unfathomable. Even Shen Lian who had reached the Tianyi state could not understand the moon and the sun unless he crossed the infinite space to have a look in person.
Nevertheless, Shen Lian tried using his divine thoughts. When his thoughts reached a certain level, he noticed a supernatural power that was comparable to the galactic-cutting and space-obstructing power by Heng'e. Unless he was able to break that, he would never be able to get to the stars in the sky.