The most difficult astroengineering task imaginable also potentially has the greatest payoff. Artificially construct a very massive metal-poor star and watch it explode in a few million years with a pair-instability supernova, a big boom not seen since Population III stars of the early universe.
For construction, I imagine a mass spectrometer like set up involving streaming matter from a nebula through a path of massive objects (charged black holes?) to differentiate hydrogen from the metals.
Artificially setting these things off (perhaps a bunch of them) could serve as a beacon visible through the entire universe as proof of intelligent (superintelligent) life.
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