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Have aliens visited MAN before? Probably not. Have aliens been by Earth sometime in it's 4 billion year history? Possibly. And it's very probable that the sent probes out this way in that time. With our technology we can dectecd Neptuen size planets around other starts. It won't be long before we'll be able to detect earth size planets. So any alien civilization that was only a few hundred years ahead of us in technology would certainly be able to know that our sun contained a planet capable of supporting life. And they'd certainly have the technology to send a probe our way.
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