When Shen Lian was in the temple, the other end of the vast starlit sky was not peaceful.
The most existence of the universe was the stars. Even the Daoist Master could not determine the number of stars. This was because every moment, there were stars dying, and stars to be born. In any galaxy, there could be billions or hundreds of billions of stars and any of the shining stars would not be smaller than Qing Xuan Earth and Star. Furthermore, the distance between any two stars was so far that it required the light to travel months or even years to arrive.
If there were not a sign in space, the travel between any viewable stars would take a much longer time.
Besides that, the people that were able to obtain energy from the void were at least at the state of heavenly immortals or had a magic talisman that could travel across the galaxies.