Some scientists and some non-scientists like to imagine that there are a million planets harboring intelligent life forms, more intelligent than us. What about THAT? Let’s do the Math.* If you spread these one million planet civilizations evenly or randomly across our observable universe, what you get is one planet civilization 200,000,000 light years away from its closest neighbor. Two hundred million light years away from each other! We can barely detect these civilizations’ galaxies with our best telescopes, and what we can see happened 200 million years ago, so even radio communication is out of the question.
So, don’t get up your hopes, next thing you know … will be a … hoax.
* Doing the Math: The Volume of the observable Universe is 8 * 1030 cubic Light Years. One of those one million chunks would occupy a Volume of 8 * 1024 cubic Light Years, a cube with a dimension of 2 * 108 cubic Light Years on a side, or 200 million Light Years on a side. The average such cube would contain more than 100,000 galaxies, so one civilization every 100,000 galaxies! Not too brimming with intelligence, eh? But the likelihood that we are IT is even more remote.