The theories mentioned by Ren Tao were familiar to Yao Yuan and Xiao Niao. It was a famous incident back on Earth. Specifically, two scientists were arguing about aliens, and one of them suddenly asked: if there are aliens, where are they?
The sentence spoke volumes. First, if we accept the premise that there are aliens or other sentient life forms in the cosmos, according to the lifespan of the universe, there has to have been aliens before the birth of humanity or even Earth itself. This is undeniable because the universe has been around for a long time. It is too conceited to assume that humanity is the first life form to appear.
If we pursue this line of thought, why don’t those aliens that have already been there for so many years before the arrival of humanity not show themselves on Earth? Logically speaking, they should have been scientifically advanced enough to make contact with the people on Earth or even make Earth their colony, so why didn’t they?
