If aliens existed we could readily see copious surface engineering in galaxies: "The germs of existence [on] earth if they could freely develop themselves would fill millions of worlds in the course of a few thousand years"(Malthus) https://waitbutwhy.com/2014/05/fermi-paradox.html … https://www.centauri-dreams.org/2012/01/23/rethinking-setis-targets/comment-page-1/ …
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"The Ring Makers of Saturn" great book - shows ships in orbit building new rings, finishing old ones. Dynamo?
But (a) engineered surfaces would look radically different from the natural dust and pebble surfaces we actually see, and (b) where are the big rings around Jupiter, you can generate more power there than at Saturn.
![Giacomo Zucco [I identify as a -e^iπ vampire]](https://pbs.twimg.com/profile_images/1172971162919415813/Pn8O2gkx_normal.jpg)
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Did you notice that Uranus has now sprouted rings? Not kidding. Big changes in our local neighborhood.
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