Carl Sagan: 4 Terrifying Reasons We Haven’t Found Aliens

We have been listening to the sky for more than sixty years. Hundreds of billions of stars, more planets than we can count, and not one confirmed message. Carl Sagan spent his whole life on that silence, and he came to believe it is the most important clue we have about our own future. It started with a question Enrico Fermi asked over lunch: if the galaxy is so old and so vast, where is everybody? Sagan left behind four possible answers. Civilizations may destroy themselves soon after they learn to build powerful machines. The ones that survive may be nothing like us. We may be listening in the wrong place, for far too short a time. Or we may truly be alone. Every one of those answers says something about where our own civilization is heading. From the Drake equation to the Wow! signal to the Pale Blue Dot, this is Carl Sagan’s view of the great silence, and why it matters more than ever. #CarlSagan #FermiParadox #Aliens #SETI #DrakeEquation #GreatFilter #PaleBlueDot #Astronomy #Universe #CosmicMinds