(((Science))) claims that the universe started 13.8 billion years

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(((Science))) claims that the universe started 13.8 billion years ago and that life on earth 3 billion years ago. That means some other alien species would have had around 8 billion year head start on us. We have not ever seen aliens nor have they ever once visited us. Imagine what we could do in 8 billion more years. Especially considering the fact that in only the last 100-200 years science has exploded(even the last 30 years). We are planned to go to mars around 2020 which people never would have even imagined 100 years ago. Even when we went to the moon thinking about mars would far as hell away. And they would have evolved to be way smarter than humans.
With an extra 8 billion civilizations could easy as fuck have been the size of solar systems and there is no way some life could not have visited us or we not have seen it through some damn good telescope. If evolution were to be real there would be 0(ZERO) chance we are alone in the universe since life would have started on some other planet somewhat similar to earth.