Before today, some scientists believed that the conditions for opening a Transition Gate at extreme distances were extremely stringent, and the Empire could only open Transition Gates on Alien Planets, unable to open them on the surface or nearby airspace of Azure Star.
As people pondered, Ji Xinghe continued: "There is another reason, that is, after the third civilization's Spacecraft crashed on Imperial Star, it took the third civilization forty-seven years to reach Imperial Star. Adding it all up, that's roughly three hundred and fifty years.
Theoretically, after a reconnaissance type Spacecraft discovers an inhabitable planet with Sacred Crystal Minerals that are very important to the third civilization, it would certainly transmit the news back at the first instance, and subsequent fleets would arrive as quickly as possible.