It would take 4.3 years moving at the speed of light to reach the nearest star. Space is really big. Bigger than anyone can imagine.
Add in the additional issues of the power needed, and all of the issues of time and relativity when traveling at the speed of light, it is a pretty good bet that we have never been visited, and we will never visit them or hear from them, assuming there is anything out there other than us.
And if you want to look at it from a Judeo-Christian religious perspective, there is no need for other intelligent life other than humans.
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