Aww, no alien empires yet

[Fsci123]

I used to think about the Fermi paradox pretty often, i came up with several theories.

I think that life is common in the universe but is microscopic. When life does evolve into complex possible intelligent organisms, it is in places that are jail like. Imagine an intelligent species developing a hi tech civ in the atmosphere of a brown dwarf or the submerged oceans of an icy moon or a supercritical ocean on hi-temp waterworld.

I made a mental list of all the barriers that can prevent the rise of spacefaring civilization.