Intelligent life seems rare on Earth. We all seem to like it a lot, but we're the only ones in the entire history of Earth, we've not been around for very long,

Intelligent life seems rare on Earth. We all seem to like it a lot, but we're the only ones in the entire history of Earth, we've not been around for very long, and we seem to be slowly sabotaging our existence. How far could someone with our technology actually pick up the signals we sent out? How many planets are realistically in that range? Then again, our existence on Earth is so brief and recent, for how long have we been looking? Less than a hundred years. That's barely anything when you talk about planets and galaxies.