Are Space Aliens Robots ???

"Where are they?" [the Fermi paradox]

Maybe he should have asked "what are they"?

There is at least one professor who thinks that space aliens are robots:

http://www.dailymail.co.uk/sciencetech/article-2859104/Will-aliens-ROBOTS-Intelligent-life-turned-AIby-time-make-contact-expert-claims.html

This could explain why SETI has not found intelligent life anywhere in the universe. All civilizations eventually create AI, and that AI kills its creators and erases all traces of them. The AIs don't want to talk to us, so they are isolating us from the rest of the galaxy until we create our AI.

And you can guess the rest of the story ...