Located 1500 light-years away from the Galactic Center, the No.7 Star of the supermassive star Hard Sun III slowly revolves on a stable orbit.
The diameter of the No.7 Star of Hard Sun III is about 19,000 kilometers, and its mass is 7.6 times that of Earth.
Its surface is devoid of an atmosphere, making it look like a barren rocky planet.
However, within its interior, a utopia has been remodeled.
Since the No.7 Star has a greater mass and a larger volume, its surface gravity is several times that of Earth.
To better accommodate the potential birth of a sage, human settlements on the No.7 Star were built at a depth of 2654 kilometers underground.
At this point, due to the differences in density between the interior and exterior materials, the gravity at this nearly horizontal level is just right at 1G, fulfilling the needs of 21st-century humans.
Around 2981, more than 8000 sprout ships of human civilization secretly arrived at this planet, directly burrowing underground.
