If aliens are on earth their behavior is indistinguishable from no aliens being on earth.
That is actually NOT what you already know unless you have assumed the conclusion, that there are not currently aliens on earth.
What we know right now is we see what we see, and what we see is what we see whether there are aliens here or not.
That is actually NOT what you already know unless you have assumed the conclusion, that there are not currently aliens on earth.
What we know right now is we see what we see, and what we see is what we see whether there are aliens here or not.