The Novus Galaxy was extremely vast and wide, but it was not always like this!
Like many things, it began somewhere, and ended somewhere!
[The answer to the question you heard the Terror of Aether spouting actually lies here.]
The monotone voice rang out in front of Noah as the tale began.
The accusatory questions that the Cthulhu had thrown towards the Central Realm indicated that even though Aldrich had carried out the actions of shattering a portion of the barrier of the Novus Galaxy and sending out a Signal to the unknown universe of exactly where their Galaxy was...the Cthulhu said that this dangerous action that would put them all at risk could only be made because the Novus Galaxy itself let it happen!
So why would this be? Why would a galaxy incite destruction to itself?!
[To understand this, you must realize the true nature of a Galaxy, as well as the workings behind it.]