> Or they exist but because the universe is huge and sparse we’ll never encounter each other. That's a good hunch. As we've learned more, the universe has app

> Or they exist but because the universe is huge and sparse we’ll never encounter each other. That's a good hunch. As we've learned more, the universe has appeared to be larger over the years. This could keep destructive contagions from spreading. If destructive contagions are likely, we probably wouldn't be here. I sort of file it under 1. where they are causally unreachable and we are singular in our sphere of influence. Or maybe 2., but over time even if space is vast, we ought to bump into each other eventually. Folks won't rest until they probe under every rock. So maybe they are out there, maybe even prolific and they (or we) are on the way to meeting each other. Humanity ought to make itself durable to see it through.