The main problem with this is that it says that human beings are extremely unlike all nearby alien races. But if you willing to admit that humanity is that unique you might as well say that intelligence only evolved on earth, which is a much simpler and more likely hypothesis.
The main problem with this is that it says that human beings are extremely unlike all nearby alien races. But if you willing to admit that humanity is that unique you might as well say that intelligence only evolved on earth, which is a much simpler and more likely hypothesis.