It is widely known that aliens is waiting for me in Area 51. However, when I visit the list of public sites, in the footer it says:
So officially who is waiting for me there?
All sorts of things await you there. Area 51 isn't only for aliens.
Our Area 51 site also features rocket ships, robots, and a bunch of other weird stuff. In fact, that same robot in your screenshot appears in multiple places on the site, most prominently on the Create Proposal page (which actually features two different robots).