C15

Liu Zizhi laughed heartily, "I read about these in a book and am researching them. "I didn't expect that after studying for a long time, I finally confirmed that this planet is our home. I didn't think that little brother would know about it with just one look."

"A book? You read this in a book? " Summer was too hard to believe. Had an astronomer crossed over?

"Yes, I found it in the market