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So the search for extraterrestrial life has been going on for quite a while, and thus far we have no explanation for why we have no contact from them or whether they truly exist. But what if the answer to this is time + distance? For example, the sun is 150 million km away from us or thereabouts and takes roughly 8 minutes 20 seconds for the light from the sun to reach us. And if the sun suddenly went dark it would be 8 minutes 20 seconds before we saw it, therefore we know we only see the changes after a brief amount of time over immense distances.Theoretically, imagine a planet orbiting a star a billion light years away, the star only originated at that point in space 2 billion years ago, we would now see the light from that star as it was a billion years ago at a billion years old. The planet itself only formed 500 million years after the star first formed. Therefore we would now see both the star and the planet, the star being a billion years old and the planet a mere 500 million years old. Now the planet is 500 million years old as we see it now but in real terms, it is now 1.5 billion years old and the star 2 billion years old. Remember we see it from a billion years ago, so if life originated on that planet a billion years after the planet formed it would be only 500 million years old at that point in time. But because of our distance from the star an planet we only see the planet as it was at 500 million years old, long before the life originated on it. It would take another billion years for us to see the planet at that point in time when the life first originated. And thus we would have found extraterrestrial life on another planet even if it was such a primitive form of life.The wait would have been a long one mind but when dealing with distances in excess of 9.460730473e+21 km the light would need to have travelled for that billion years to get to us.
The physicist Enrico Fermi asked the same question.This has provoked a lot of discussion on the subject.See: https://en.wikipedia.org/wiki/Fermi_paradox
The entire Universe is in the present always
Theoretically, imagine a planet orbiting a star a billion light years away, the star only originated at that point in space 2 billion years ago, we would now see the light from that star as it was a billion years ago at a billion years old. The planet itself only formed 500 million years after the star first formed. Therefore we would now see both the star and the planet, the star being a billion years old and the planet a mere 500 million years old.
Here is another interesting answer: Q: Where are all the aliens?A: They are all asleep!See: https://spectrum.ieee.org/tech-talk/computing/hardware/computing-and-the-fermi-paradox-a-new-idea-emergestheyre-all-asleep