Worrying about an alien civilization coming to visit and take everything is like a moss cell sitting on a rock in the Himalayas fretting that in the next few days an exotic bacteria nestled in a thermal vent in the Mariana Trench is going to show up and stake a claim.
It's actually significantly less probable than that by many orders of magnitude but it's hard for humans to grasp just how isolated everything in the universe is from everything else.
It's actually significantly less probable than that by many orders of magnitude but it's hard for humans to grasp just how isolated everything in the universe is from everything else.