Do you think that we are alone in the universe?, have you ever heard talk about The Fermi Paradox? whatever you answered to these questions in this post I will answer you the second one, because I don't have the answer to the first question.
Fermi, a physicist of the 20th century, developed the first nuclear reactor and contributed to the development of quantum physics, nuclear and particle physics, and statistical mechanics. But that was not all his legacy, in the middle of the 20th century, he noticed in the contradiction between the statements that advocate a high probability that there are civilizations in the universe, and the lack of evidence that we have to respect.
The Drake Equation, estimated that getting in touch with someone there outside is not so hard like it seems, Fermi was wondering where they are? There are thousands of possible answers to this question but that still have no answer.
In the following videos part of a detailed explanation of the Fermi paradox is answered in various ways to this question, if you like you can comment in the post which one you think more consistent or if you have another... it wouldn't be too bad listen to it!
I hope you enjoy it ;)
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Source: <a href="https://www.youtube.com/channel/UCsXVk37bltHxD1rDPwtNM8Q">Kurzgesagt - In Nutshell</a>