We're not. Anyone that thinks we are is a fool.
And a man who professes himself to be wise is a fool. It's a good guess as any to believe there are aliens out there, but there's just as much proof as whether or not the world will end in 2012.
butwhat if we are
People are so strung to the idea that life will work just like life on this planet, hell who said life had to be water?
The universe has certain ratio of elements present. Hydrogen, helium, oxygen, and carbon are the most abundant, in that order. It's only natural that life will follow that ratio as well.
I'm not even going to entertain the idea that we are.
What?The only life we know is that on Earth. I have no idea how you reach that conclusion.
Those elements are also some of the most chemically active. It's hard to fathom life based on heavy, nonreactive elements.
There are a ton of elements.
But not many as active as hydrogen, helium, oxygen, and carbon.
Here's a thought: What if, just MAYBE there are MORE elements on the periodic table than the ones we know of?
The only place left to fit more elements is on the end, with more electrons. Radioactive elements are highly unstable and decay extremely fast. The heaviest elements can only be produced for seconds at most before they decay.
Implying there aren't forgettons of elements we're missing in the middle and less electron end.