It has to be great filter. Given billions of years head start even if one civilization made it then galaxy would be filled with colonies in every soloar system...all intelligence must go way of dodo, just like were going. Technology evolves so much that our ape brains cant control it...or its simply we pollute the planet to the point were we devolve and are unable to leave.
scatman54 t1_jcwjtgo wrote
Reply to The Fermi Paradox and the Possibility of Intelligent Extraterrestrial Life by Beginning-Court1946
It has to be great filter. Given billions of years head start even if one civilization made it then galaxy would be filled with colonies in every soloar system...all intelligence must go way of dodo, just like were going. Technology evolves so much that our ape brains cant control it...or its simply we pollute the planet to the point were we devolve and are unable to leave.