Our universe is so big that it's unimaginable. There are billions of planets out there, do you really think that out of all of these billions of planet, Earth is the only one with life? Just think about it, this is why I am 99.99% sure their are aliens out there. You Alien skeptics may think 'If Aliens existed, then surely they would of come to Earth'. As I said before the Universe is so big, that it would take a VERY long time to reach us, and we know their are no Aliens near us because all the planets in our Solar System have no life, and it takes so long to even get to the furthest planet in our solar system. I would even go futher to say I strongly believe there are massive alien civilazations, with much more advanced technology than our own.

Recently, scientists spotted a planet much like our own, which further supports the idea that there is life out there. The article can be found here Science Scanner: NASA Telescope Spots Earth-like Planet « Science World