Edit- thank you for all the comments and particularly for the links to videos and further info. I will enjoy trawling my way through it all! I’m so glad I asked this question i find it so mind blowingly interesting
https://waitbutwhy.com/2014/05/fermi-paradox.html This is the best article I’ve come across, and it has really easy to understand pictures (also I just love this site and everything he writes 😆)
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