Life in general is very fragile. It only takes one thing to go wrong for it to end, but it takes many things to go right for it to thrive. Fortunately for us, Earth happens to be the only known planet where everything has gone right. There are hundreds of billions of unknown planetary bodies through out the universe and possibly more than that. So even if Earth is a one in a million, or even a one in a billion, that means that there are hundreds of other planets in the universes like Earth. Or, on the other end of the spectrum, Earth could possibly be the one and only of its kind, but I find this hard to believe given the massive number of planets that are out there.
This is why I believe that aliens do exist. Although, I do not believe in any of the conspiracy theories out there about Area 51, UFOs, etc. I refuse to believe in any such things until hard proof surfaces and the scientific community accepts it. The aliens that I am referring to are organisms that are still at the cellular level. I believe that there are planets out there that support single or multi-cellular organisms. Life, although fragile, is resilient in that it can exist in extreme environments like at the bottom of the ocean or where the sun never shines. This means that it is not that hard for life on a planet with extreme environments.I also believe that there could be organisms that are evolved to the point where they are full-grown animals. These two examples of alien life seem the most likely to me, especial cellular life, but I do recognize the possibility of a planet that is home to intelligent life. For all we know, there could be a species out there that has technology that is centuries ahead of our own, or they could still be in a stone age. Even if life does exist elsewhere, it could be on the other side of the universe where humans will never venture. Most anything is possible, but all of this is yet to be proven.
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