I just wanted to make a comment on aliens.
What is alien life:
See the Bubble as an organism of itself. Any alien life we encounter is a separate and fully evolved multilayer bubble of life. Humans can not survive without the full spectrum of life in the entire bubble. It is one system, and it is all interdependent. The Bubble is "sentient", it tries to preserve its own life and tries to expand its borders. It has internal security to root out "cancers" and it evolves over time. It makes very complex decisions and enables for massive community goals to be conducted that influence the universe around it. It is alive, sentient and dominant.
So, if Aliens would look for "aliens" and would find one of our rear end bacteria (a cargo pod with biowaste), they would have found proof of the "bubble" as well. They would treat the find as a potential alien "Bubble" and not as a small insignificant organism. A possible threat, but yet so tasty for curiosity.
The same goes the other way around: If we find a piece of poo that is alien, we have found the proof of concept that we are not alone in the universe. We also realize a potential hostile Bubble entity out there, in whatever form it may take ( it may be completely different type of life and structure compared to our own Bubble, different travel technology, different connection and communication technology, maybe even not depending on technology at all, but highly efficient organic evolved tissue and magic(too us) phenomena. ).
So all we have to do to find alien life is to find anything that is completely separate from our own type of life. That requires microbiology sensors on our ships. I say we need an update to the Exploration modules soon.
The problem with finding life that is so different from our own, is that it may be totally invisible for our eyes, unless we open our minds and realize that life can be totally different than our own imagination allows.
It may not require water, it may not require electricity. I may not be in our own scale at all. It may be so huge it is beyond our visible range of the universe, or so small its lifetime is so fast it dies before we can ever discover it.
To look by rules of self is a road that narrows too quickly.
We could have bubbles that use the same resources, and thus are hostile in environment to each other, unable to live in symbiosis. But we could also have bubbles that live off of completely different resources from each other, even producing waste that is valuable to each other, making perfect symbiosis. Depending on what type it is, we get different kind of relations to these forms of life.
It may be so that the alien life is so way beyond us, that their interest is completely different from our interests, making interaction null and void, not by curiosity but by rules of nature. Giants do not interact with ants, not because they are not curious, but because they are completely incompatible to interconnect and communicate anything worth while. And vice versa.
Etheric life, life within electromagnetic phenomena itself, may interact with us, but the physical and practical application of such may be useless to both. Also, this form of life, which can be residing as virtual patterns and structures within the background radiation, may or may not be impossible to detect. The threat of such life could however be monumental, because it could alter our minds and control our mentality. It could even literally be the essence of our souls for real. Ever wondered about why you look at the universe through your eyes, and not through anyone else's...... is your body a prison for your soul?
Life that have created us in their universe as totally virtual simulations, may never be detected nor proven. Yet they could have total control over us and our fates. As we could have control over any simulated universes of our own. That is also a form of separated life.
A macroscopic lifeform could be so huge, that our universe is just an atom in their scope. Meaning we can never communicate with them efficiently and they can never communicate with us, because time goes to fast in our scope. In the opposite spectrum, sentient life in our own atoms would live so fast they would evolve, prosper, spread, be dead and extinct before we can even blink. Unable to confront any such lifeforms, but still realize that they could be there, in an infinite universe where scale and scope is the interdimensional parallell universes that physics predict. All interconnected in plain sight.
The very laws of nature could change over scale and scope, allowing for any form of universes ever imagined, where the only scale we humans can and will exist in is in our own scope (but it is endless vast on that scale). Anything in our own scale abides the same laws of nature and structures accordingly, but stray into macro or micro cosmos and you find that nature changes the laws to produce all these infinite universes and realities that is our existence. Maybe life as we know it, can only exist on this scale. Laws of nature could be, and probably is, too different in other scales to harbor any form of life.
If we could travel through the scopes and scales, we would open up all these parallell universes for us to explore, leaving our own scope and scale to oblivion, but allowing for new ones to be experienced.
If our universe is a scale and scope of an atom in a macro cosmos, think how vast our universe then becomes, when compared to our atoms and the distances in our own galaxy alone.