Following the methods of the Krypton Gold Civilization, the Wandering Alliance conducted observations.
Indeed, they discovered that if one were to observe based on material abundance, one would find a conspicuous void left in the regions the Wandering Alliance passed through.
In this void of star space, all the matter and nebulae originally preserved had been plundered by the Wandering Alliance during their passage; although after the Wandering Alliance had left, matter from farther regions started moving towards the void, the speed of replenishment was slow. Therefore, observing at this moment, one could very clearly identify a blank strip in the star space.
This blank strip of star space can be said to be a true vacuum, and also the movement trajectory of the Wandering Alliance.
If an Advanced Civilization were to follow this unique "movement path," they would easily locate the Wandering Alliance, something the latter had never considered before.
