Aliens are the only thing possible or likely.
God is a creation of man. Man created God to explain the things he could not understand.
Yeti's don't exist. They are neither our imagination or a fiction, just a misunderstanding of what was at one time.
Ghost are a figment of our imagination. We created them to explain what we cannot process.
If aliens exist, and in some form they likely do, they would likely be no more superior of intellect or intelligence than we are. Our world alone is 4.5 million years old and we are this evolved and this intelligent. While the universe is twice more older (13 million years old) you also have to take into account the ability for those civilizations to survive resource depletion, local star aging, or a collision with an object in space, such as an asteroid or comet. And they would have needed to do so in an even younger universe filled with far more upheaval than we currently experience today.
So, if aliens do exist, they will likely not be far superior to us and more likely less.







