In the boundless universe, as well as the celestial bodies such as stars, planets, and comets, space was actually not an absolute vacuum but filled with floating cosmic dust in most places.
Their elements were fundamentally the same as the elements that constituted planets, which were all the powder of rocks and metals. Restrained by appropriate gravity and force fields, they often condensed into celestial bodies that looked like clouds. They were also known as 'nebulas'.
Kunlun, the relic of the Pangu civilization, was hidden inside a crab nebula. Right now, there was another nebula that seemed to be a black spot.
It was also possible that the Pangu civilization had grasped a certain secret technique that allowed them to manipulate the nebulas.
