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I always wonder what we must look like to the astronomers on those distant worlds...

This is a good question. If they are like us, with somehow the same technologies, it's no problem. But if they are far more advanced, I think we have a problem, of good looking. Or better said, no so good.

Maybe they have already been/ already are here?...

Yes. I am here.

Careful not to blow your cover!

Too late. Everyone knows I'm strange.