I want to share a few thoughts of mine on extraterrestrials that I haven't read or heard of anywhere.
Astronomer and SETI (Search for Extraterrestrial Intelligence) researcher Jill Tartar says the world needs a cosmic perspective and we need to think in a way where we see ourselves as similar. I suggest the similarity isn't restricted to us earthlings but can be extended to all aliens. This admittedly strange way of thinking can be traced back to comments made by the English scientist Brian Cox (famous for his TV documentaries). Prof. Cox has said Earth is probably the only planet in the universe that gave rise to intelligent life. His reason for saying this is evolution. Personally, I believe the origin of life cannot be explained by biological evolution, though its validity to that already-originated life can't be doubted.
But evolution's not the point here - the point is that intelligent life is here (I think) and that we've started exploring space. I further believe that, someday, we'll be able to use the Riemann hypothesis and Wick rotation to travel billions of light years in the blink of an eye. The Riemann/Wick things will also allow time travel (into both the past and future), using General Relativity's concept of curved time (which is made circular via Wick rotation and future warping of space-time). Walking on the Moon would have been fantasy and science fiction hundreds of years ago - instant travel anywhere in spacetime may be everyday events centuries from now.
Time travel plus instant space travel permits us to explore and colonize any place in space, anywhere in the past or present or future. Those colonists will surely be very different from us in some respects because they'll have to adapt to very different environments. Some of the changes will be due to natural adaptation, and some to selected bioengineering that we haven't even dreamt of yet. But the aliens' origin will be human and they'll always be more similar to us than different. The aliens could be anywhere and everywhere in space and time.
If they set up a colony thousands or millions of years in our past, they'd make today's civilization on Earth look like the activity of insects - or, as Prof. Michio Kaku has said, squirrels - and we couldn't blame them for not being terribly interested in contacting us at the moment. It'd be in our best interest for them to leave us alone for now since we might not be able to even comprehend their being millions of years ahead of us - we might arrogantly dismiss them as ignorant because they couldn't accept what we firmly believe to be facts.
To sum up - the movie "Interstellar" seems to be correct when it says people will someday be able to do things they can't do now.
"we'll be able to use the Riemann hypothesis and Wick rotation to travel billions of light years in the blink of an eye"
Sorry - the Riemann hypothesis is not correct!
Sorry, but all this is too vague, the main idea is too well disguised by enthusiastic words.
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