Are We Alone In The Galaxy? Updated Drake Equation Suggests We Might Be

[Maxmars]

Hey Nerb here's a relevant article on Sagan's position concerning the 'strong probability' of the Earth being visited by ETs every few thousand years.. and alien moon bases.

I had heard (but I'm not certain it's true) that Dr. Sagan was "convinced" to withdraw his support from the idea of alien/ufo topics by the "authorities."  They didn't want him fanning the flames of public interest in this area... That if he wished to be relevant as a scientist, he had to stop speculating on such things in public...

I wonder if that explains his relative silence, and even resistance on the matter later in his career.