I have to say I don't believe that the declassification yesterday of the British Ministry of Defence files reporting encounters with unidentified flying objects in British airspace shows that we have found aliens. However, I am open-minded about the possibility that they do exist.
Space probes have revealed evidence for water, suggesting that Mars may once have been hospitable to life. As well as life could also exist in the ice-covered oceans of Jupiter's moon, Europa.
I think there is abundant time for posthuman intelligence to spread through the entire galaxy and even if life were now unique to Earth, we should not conclude that it is going to be like this forever, since the cosmos is still nearer its beginning than its end.
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