He as a good point about aliens. Considering how large the universe is and how far we can look and listen into space with our modern tech we should be able to detect aliens/civilisations whether they are advanced or not yet we are not able to find ANY at all. Not even remnants of anything civilzation-like. Its completley dead and silent.,(reply>), Plenty of ET action.  See YT channel of Steven Greer, and SpaceNatives.