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there are literally Millions of Stars out, most have their own planets
are some of them capable of sustaining life I am sure there are literally thousands that can maybe not life as we know it.
and the possibility that some of them could be advanced enough to travel through space and time isn't that far fetched either.
I am sure in the next 100 years we will begin to find ways we can do it too. Some people say we already can.
I guess if these "Aliens" are out there and their evolution started a million or two earlier then us then they very well could be showing up in our galaxy.
as for us being so insignificant to them I don't think thats even an issue Look at our scientists that study bacteria thats pretty insignificant but we have thousands of people that study it.
Who knows but until solid proof is really shown we can only speculate
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