Star Zone 170 of Feige Hub was, in fact, an artificial planet.
Taking gravity into account, the artificial planet had been built with a diameter of 10,000 kilometers, roughly 78% of Blue Star's diameter.
The artificial planet's gravity was slightly weaker than Blue Star's, so as Su Yu walked down the street, he could clearly feel his body becoming light and buoyant.
The planet was located within the habitable zone of the Feige Star System, but due to distribution considerations, it had been placed on the outer edge of that zone. It took roughly 650 days to orbit its star once, comparable to Mars's orbit.
The numbers assigned to the star zones basically reflected when they had been constructed. Starting from Star Zone 1 and Star Zone 2, Feige Hub had densely built over a thousand star zones throughout space.
Of course, not all of those star zones were artificial planets. Most of them were space cities.
Star Zone 170 was located on the outer edge of the habitable zone, so it received very little starlight and had an extremely low average temperature.
Therefore, a grayish-black shell covered the entire surface of the planet.
After entering the star zone, the first thing Su Yu and Cat Morning Star did was naturally look up at the sky.
But the sky of Star Zone 170 was not Blue Star's blue sky and white clouds. Instead, it was an enormous grayish-black metal shell.
It was precisely this metal shell that maintained the planet's average temperature.
Through the greenhouse effect, antimatter annihilation power generation, and a series of other measures, the average surface temperature had been raised to around 14 degrees, making it suitable for all living creatures to reproduce and reside.
Without this shell, the planet's nights would reach a freezing minus 143