What are you reading?

[Mister Agenda]

I've read a book about the Fermi paradox and I didn't realize how interesting concept it is. There is probably someone in our "neighborhood," but we have no evidence of them. So the question is, why?

I guess you could say that the space is too large, making it difficult to contact someone even with a signal, let alone a drone. And you probably do not need drones or spaceships to explore the universe; enough advanced computers could probably give you satisfying guesses about what the planets in the galaxy look like. Thus, if aliens are just little more advanced than us they have probably calculated that our planet has life, including intelligence, therefore they could be driven to send us a direct signal or some drone. But nothing yet.

So, every time you appear to have found an answer to the Fermi paradox, you raise new questions.

Or technological civilizations are rarer than Fermi thought and we're very far from the nearest other one. Our radio signals have only made it about 100 light years. Or they're closer than that and detected them fine and are on their way and will get here in a couple of hundred (or thousand) years, eager to learn more about us.