It's the Fermi paradox isn't it? The universe is stuffed to the brim of planets that can sustain life. Some by chance should be kuch more evolved than us, but we hear nothing on the airwaves, so 2 reasons, we truly are on our own, which is vanishingly unlikely, or advanced civilisations (I use the word guardedly) Rise and fail in a short time span. If the latter is true, we're probably on borrowed time now.