Chen Lei told them everything...
The Chen family had lived in this star area for dozens of thousands of years. They had the family records. The rumors said that from the beginning, there wasn't even a single mineral star around Heaven Cloud Star. They had only dead stars and many massive hovering meteorites. They had sometimes blocked the way.
The Chen family used to seclude and they had only cultivated in their Heaven Cloud Star. When they needed cultivating materials, they visited the market in Thunder Firmament Star Area.
According to the Chen family's records, there was a terrifying commotion at the star area barrier ten thousand years ago. A loud explosion accompanied with reverberating thunder like doomsday was heard all of a sudden. The precursors of Chen family came to check and found that a large area of the space barrier was shattered. Dazzling electrical beams shot out and killed many warriors of the Chen family who came to investigate.