It's popular to suggest we don't hear aliens because they all destroyed themselves. But a basic RF link budget calculation shows that even an Arecibo sized antenna pointed perfectly at another Arecibo telescope on an alien planet, and listening/transmitting at the exact right times, could only barely contact one or two of the nearest stars.
This fact is buried in all the Fermi Paradox discussions because Fermi's point was the implications of his work on nuclear weapons when he brought up alien contact.
It has since been used to make the case for Reagan's Strategic Defense Initiative. Which apparently Elon Musk is now continuing... https://ioc.exchange/@muskfiles
This fact is buried in all the Fermi Paradox discussions because Fermi's point was the implications of his work on nuclear weapons when he brought up alien contact.
It has since been used to make the case for Reagan's Strategic Defense Initiative. Which apparently Elon Musk is now continuing... https://ioc.exchange/@muskfiles