So... we're going to Europa soon. This is a big deal, or at least has the potential to be a big deal. Europa is one of Jupiter's moons and, as it turns out, is home to an enormous sub-ice ocean. In fact, despite the fact that Europa is much smaller than Earth, it's ocean is much larger than Earth's ocean.
Now, everywhere on Earth that we've found water, we've found life. Europa has a lot of water, therefore it might have life. If we find any form of life on Europa, then we can conclude that life exists virtually everywhere throughout the universe. The odds of life randomly springing up twice in the same back-road solar system and nowhere else are too small to quantify.
Of course, if the universe is truly infinite, as most physicists seem to believe, then not only does life exist everywhere, but lives that are nearly identical to this life exist everywhere. After all there are a finite number of elements and a finite number of ways these elements can bond together, meaning that in an infinite universe the exact specifications for our lives would be remade over and over and over again.
So, that's fun.
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