No, not that silence. What was I saying? Right. A new paper suggests that the reason we haven't found any life yet is that it's simply all gone extinct. Astrobiologists and authors of the paper, Aditya Chopra and Charley Lineweaver, make the point that, early in their formation, planets are incredibly inhospitable to life. There are volcanoes erupting everywhere, spewing gases into an early atmosphere, there are lots of meteorites smashing into the planet, and overall, life just doesn't have much of a chance.