Theres a few good videos on you tube that try to look at (not answer) some of these sorts of questions in a fun and easy to understand way. They are worth checking out if you haven't already stumbled across them
The Fermi Paradox -
Part 1
https://www.youtube.com/watch?v=sNhhvQGsMEc
Part 2
https://www.youtube.com/watch?v=1fQkVqno-uI
Limits of Humanity
https://www.youtube.com/watch?v=ZL4yYHdDSWs