There is no sign that we will ever send out Von Neumann probes, so why should I believe that any other intelligent civilization will do the same thing.
Or, how do we know they haven’t reached us? Maybe they stayed in the outer solar system. Maybe they came, looked, and left. Maybe they have some sort of cloaking device technology. Maybe they are really small. Maybe they came during the age of dinosaurs and probe is still out there in space, shut down and waiting to be discovered.
> There is no sign that we will ever send out Von Neumann probes
Unless human civlization collapses, why not?
> Or, how do we know they haven’t reached us? Maybe they stayed in the outer solar system. Maybe they came, looked, and left. Maybe they have some sort of cloaking device technology. Maybe they are really small.
Ifthere is even one more civilization sending out probes, that implies there are many within our light horizon sending out probes. I find it implausible that every single one would choose the same strategy of keeping probes stealthy and undetectable.
Or, how do we know they haven’t reached us? Maybe they stayed in the outer solar system. Maybe they came, looked, and left. Maybe they have some sort of cloaking device technology. Maybe they are really small. Maybe they came during the age of dinosaurs and probe is still out there in space, shut down and waiting to be discovered.