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Actually, if the estimates of 40 billion Earth-sized planets in habitable zones of sun-like or red dwarf stars in the Milky Way and the estimate of the 100 billion to 200 billion galaxies in the universe are accurate -- and if the average galaxy has roughly the same number of Earth cousins as the Milky Way, then the chances that we are the only planet with life are more like one in 6 sextillion.
originally posted by: Mianeye
I think that life in our Galaxy is very common, that there is so much life that we become insignificant to other space traveling species.
They might have scouted our planet/solar system, but don't really care about us, because of our early stage technology wise and destructive behavior .
originally posted by: Nexttimemaybe
They may well have sent probes and it may have taken thoysands of years for those probes to reach us. How would we ever know?
Why haven't they visited us? Because the technology doesn't exist to do so.
Entities seen on this planet have always been here, they are not visitors.
That is highly likely due to the fact we know you cannot travel faster than light. Nothing can.