We are not alone.

^You're right. We're definitely NOT alone! Our planet Earth can't possibly be the only inhabited planet in the entire infinite Universe. Btw welcome back Superboy! :-)

There's got to be more out there - who knows how big space is? What if space to us is like the ocean to some giant species and we are the fish to them? It's mind-boggling to think about

There are quite interesting theories and videos about this topic. And there also was the scientific calculation how many earth-like planets might be out there. If they also happen to be in the right distance from a star that they`re orbiting around - ta daa, another inhabited planet there. Only problem is that space is so vast and distances are humongous. It might take many years to contact each other or it might never even happen if the planets are too far apart. But it would be awesome to experience meeting someone from another planet. As long as they are friendly. :D

We're obviously not. Statistically speaking, there's very little chance that there are no other orgabic life forms in the universe. It also depends on what you define 'life' as. Even the smallest micro-organism can be biologically defined as alive.

There are trillions of stars in the universe. Even though a planet being able to host life is rare, you have to keep things in perspective.

For example, someone could use a very low percentage, say 0.00001%, and claim the chance of a star having both a planet and said planet being habitable for a specific type of life-form (even, as Kuro_Hyou said, the smallest micro-organisms) is only one hundred-thousandth of one percent (I'm not sure what the actual percentage is). Still, the possibility of life would seem pretty unlikely, right?

Except that 0.00001% of a trillion stars is still 100,000 stars. One hundred thousand possibilities for a star to have a planet and to have said planet host life still available. And that's only with one trillion.

There are literally so many stars in the universe that the number is just too big to make the phrase "Earth is the only planet in the universe that has ever and will ever have life on it" without being illogical.

Why should we be the only ones here !

Gonna basically steal my own comment from a different poll.

Like Arctic said, it's extremely unlikely that there wouldn't be life on other planets, considering how many billions of planets there actually are.

So why haven't we ever detected signs of life elsewhere? There are a few options here and I don't which one is the most likely.

Either:
1. Civilisations might emerge and develop and burn themselves up simply too fast to find one another. We're not just spatially isolated, but temporally isolated.

2. Considering the age of the universe, what are the chances that our neighbours are right at our level? It's far more likely that they're way, way behind us (and can't communicate) or way, way ahead of us. If it's the latter, consider that we exist in a backwater, pretty far out on one arm of the galaxy. Go to Google Maps and input "central Australia" then click "+" several times until you get to nothing and nowhere and that is where our solar system is - way the fuck off the highway. They probably see no benefit at all in communicating with us. And considering our extreme distance to anywhere important, we wouldn't have developed the tech to communicate with them. Maybe we're just relatively in the stone ages, trying to communicate to the other side of the world with smoke signals.

3. I've read that our type of sun and solar system, which is good at supporting life, is actually among the first of its kind. So maybe we're it. Maybe we're the ancients that get to fuck around and be enigmatic badasses leaving strange wonders for other races a billion years from now.