All the planets within its star have been dismantled, along with the material from surrounding star systems, creating a ring-shaped world encasing the Constant Star Furnace, crafted by the Star Trading Group!
On both sides of the ring, there are clusters of cities, industrial groups, and habitat environments similar to planetary surfaces.
In the face of Level 4 Civilization technology, forget about concepts like "round heaven and square earth"; transforming the world into a "ring-shaped belt" like this is entirely achievable.
Around the ring world, there is a giant Star Gate, standing empty in the vacuum, with no ships passing through.
"Why is there still no news from the front-line fleet? Subspace communication has been interrupted!" Commander Yak of the ring world is anxiously waiting for their fleet's return.
"Yak, it's the final month!" Huo Sen from the Ptolemy Civilization said to him, "If there's still no news, everyone evacuate the M35 Star Cluster!"