xkcd #3225: Satellite Pollution
Title text:
We’re working to make sure the images are as up-to-date and accurate as possible, with a minimum number of sponsored galaxies.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3225/
Would be the least surprising thing, out of all the advanced civilizations actually existing options.