Wiktionary
n. (context scifi English) The construction of megastructures in space by technologically advanced beings.
Wikipedia
Astroengineering is engineering at astronomical scale, i.e. at planetary, stellar, stellar system, galactic or even larger scale. It is a form of megascale engineering. An example is the hypothetical Dyson sphere.
Usage examples of "astroengineering".
The moon first had to be stripped, by astroengineering, of its thick atmosphere.
After some negotiation over a radio channel it agreed to open three of its domes to humans, who would use the space primarily as a dormitory town for the astroengineering companies.
It resembled the kind of starship which might have been built if the practicalities of the ZTT drive hadn’t forced a uniform spherical hull on the astroengineering companies.
And with their planet’s electronics reduced to trash, its spaceships smashed, its SD platforms vaporized, and its astroengineering stations in ruins, there was absolutely nothing Nyvan’s population could do to prevent the onrush.