ALL TRUE, But Remember One Other Factor; the "Universe" is supposedly "Infinite," which suggests that "Contact" is, at least, "Statistically Possible!!"
In an "Infinite Universe," our "Lack of Contact" may Simply be a Statistical Event!!
An "Infinite Universe" is FAR LARGER than we can imagine, & chances of "Contact" may be FAR LESS than we can Calculate.
Doc
I understand that, Doc, but we also must have the mind open enough to allow that an extraterrestrial species may be unlike us enough that we wouldn't even recognize it as being alive. Even an intelligent species.
What if they would have life spans in the tens of thousands of years instead of in the hundreds of years? Would they really be moving as fast as we do? What if they don't even move physically at all but only in some sidereal fashion.
The possibilities are endless in an infinite universe.