Life apart from our planet EARTH

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does anyone here beleive that there is a great possibility of the presence of life apart from earth??? Or to be more specific, do you guyz beleive that there are aliens in our universe??? I do beleive that thre is a possibility of aliens in our universe the reason simply is that if we go to the basics, we all know that there are billions of galaxy's and each galaxy has billuions of stars now lets consider that there are 1000000000(1 billion) galaxies and 1000000000(1 billion starts...) so there are a total of 1000000000x1000000000=1000000000000000000 stars in our universe!!!!!!! now lets conider an average of 5 planets revolving around a star(the sun is a star) then there are a total of 500000000000000000 planets!!!!!!!!!!!!!!!!!!!! out of which, life has been opnly known to have on one planet and that to our EARTH!!! so dont you think that life would be there on those 4999999999999999999planets left???????