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Why do we not see any signs of advanced life? Is there a filer in the universe that prevent life from colonizing galaxy.
The scenario is based on evolution of life as we know it: from the star system, through first life to an advanced civilization where humanity is now. Space faring technology is available on a very limited scale but there is nothing in theory that prevents development of technology that will permit sending probes, manned or unmanned, to other solar systems. Once extra solar human colonies start sending out new colonists to uncolonised star systems, we have the start of a colonization explosion, possibly in the form of percolation
The Fermi Paradox suggests no one has done this before and the Great Filter suggests that something stops life before becoming a space faring civilization. It is possible that the filter is prior to human civilization, that all the things that makes human civilization possible is so small we are alone. It is, however, also possible the filter acts at a step just prior to the colonization explosion step.