What if you woke up one morning and you found out that humans are alone on planet earth?
Are we alone - there's no evidence that life exists on other planets, let alone intelligent life. Based on the law of probability, the odds are against there being human life anywhere else in the universe - at this point in time. Any signal that we could send or detect in outer space would be old, based on the amount of distance away in light years, by the time we or anyone else detected it. The source could be long extinct by now - measured in millions of light years.
