Whether Aliens Exist

Oops, apparently I read round 1 completely wrong. I'm very sorry about this... But, I'll play devil's advocate and support this side of the argument! Rebuttals 1) "Consider the universe. We can only see a fraction of a fraction of it, and we know that the universe is pretty big. We stand out among the stars as living creatures developed from a seemingly unlikely combination of ingredients that created life. But again, the universe is too big to comprehend, and with all that emptiness, there is bound to be life somewhere outside of Earth." For one thing, being extremely large does not give any credit to the idea that life is easily formed on other planets. As you said, life developed from a seemingly unlikely combination of ingredients that created life. We do not know how unlikely this combination is, and how unlikely the circumstances are that allowed these ingredients to perfectly mix to create life. The universe is very big, but it is finite. Also, you stated in the comments you are talking about intelligent life, not just simple life forms. We have no way of determining the likelihood of intelligent life spawning from a planet. It may be so rare that it actually hasn't happened outside of this Earth. We don't know for certain. 2) "Scientists and astrophysicists are finding more and more evidence that alien life does exist. Three planets were recently found that revolve around their sun at just the right distance to produce water, a seemingly desired substance for life to exist, though not particularly necessary. This leads me to my third argument." Finding planets in a water-allowing region does not mean that life had all the components and circumstances needed in order to be created. This could be an astronomically rare occurrence in the universe, and may possibly be just dumb luck that it happened once, here on Earth. And even if it was able to occur, this does not mean that intelligent life would be likely at all to form on those planets. 3) "We are limited to life. We require certain substances in order to survive, such as water, oxygen, a perfect mixture of heat and coolness, and food. But this is all we know. We see the world around us and what we see as life is what we comprehend as life. But again, we are limited. It is likely that aliens might not even be able to survive on our world, because they have adapted to a different environment on a different world. Their bodies won't work the same, and they certainly won't look the same. If aliens were born to adapt in a different kind of environment, then the chances of their existence are much higher, for they would not require a world like ours." This is pure speculation about life itself. We have no evidence to show that life actually exists outside of environments that have existed on Earth. If we are just talking about a different mix of water, oxygen, and temperature, then this has already existed on Earth. Earth has had very different environments since its beginnings. Sure, it's evident that biological life on Earth has been able to adapt to extreme environments, but this does not mean that life was able to even begin on potentially habitable planets. Having the potential to sustain life doesn't mean it's going to happen. We don't have any evidence to suggest that this would happen more than once in the universe. Because of this, we can't say for certain whether aliens exist or not. So far, there has been no evidence presented that shows that Aliens in fact exist elsewhere in the universe. The only things stated have been speculation and suggestions that life could exist on other worlds. This doesn't prove that abiogenesis occurred on these worlds, and it doesn't prove that it would likely happen. Because of this, Pro has thus far failed to meet her burden of proof to show that Aliens DO exist, let alone intelligent Aliens. I await your response.