Hi, Buzsaw.
Being a long-time science fiction writer, I feel somewhat qualified to answer some of your questions.
Buzsaw writes:
In summary, if a higher level of intelligence is possible, why not a higher state of physiology.
In this case, "higher intelligence" need not be an entity with a better or more efficient brain than ours, or even be built superiorly to us: they need only to have studied longer, harder or with less distraction. No new "type" or "state" of intelligence is needed.
I won't say it that a new state of intelligence is impossible, but we don't need to discuss it to consider a being that could travel space.
I would personally be more interested in the
non-intelligent alien life that we might find. I suspect that non-intelligent life is much more likely to be abundant, and it could really expand our knowledge of biology rapidly.
-Bluejay/Mantis/Thylacosmilus
Darwin loves you.