The one thing that I never really hear proposed about technologically advanced alien life is the fact that it only takes one species to spread beyond the confines of its own world and start populating other worlds within and beyond its own star system and the whole process becomes practically unstoppable.
Then, given enough time the force of natural and artificial selection will drive the various colonies further and further apart until they reach a point where many colonies basically become 'alien' to each other and even loose contact.
The whole thing can of course then start again with one or many of these branches, like seeds of trees growing into trees themselves and then spreading their own seeds.
It could well be that there are thousands of civilisations out there who are very different from each other but can all trace their genealogy back to one common ancestor.
This, I think, is also something that needs to be factored into the Drake equation.
Then, given enough time the force of natural and artificial selection will drive the various colonies further and further apart until they reach a point where many colonies basically become 'alien' to each other and even loose contact.
The whole thing can of course then start again with one or many of these branches, like seeds of trees growing into trees themselves and then spreading their own seeds.
It could well be that there are thousands of civilisations out there who are very different from each other but can all trace their genealogy back to one common ancestor.
This, I think, is also something that needs to be factored into the Drake equation.
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