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Originally Posted by Worldseries27
so we exist but no others can?
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They can but not likely they would join us. The universe is 14 billion years old. They could have existed a million years ago, 100 million years ago, 1 billion years ago, but here at the same time as us? Not likely. Also, as commented above, space is vast. Also, out of trillions of earth-like planets in the universe they chose to visit this one? Again, the odds are not likely.
I wrote a research paper about this. There's a long list, which I won't bore you with, of great odds to overcome for an alien species to come to Earth. The odds are 1 in 1 followed by a lot of zeros.
Sorry, but we are here in this solar system by ourselves.