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However, an intriguing possiblity is that if Dyson spheres were built around common dwarf stars and they break after a while, we might find pieces of broken Dyson spheres in interstellar space.
In a recent paper, I suggested that the anomalous interstellar object, `Oumuamua, discovered in 2017, might have been a piece of a broken Dyson sphere because of its unusual flat shape and non-gravitational acceleration. If Dyson spheres exist around common stars, this might not be unreasonable.
Once a civilization abandons its Dyson sphere, the shell’s infrastructure will be punctured by micrometeorites and lose its functionality within millions of years.
If other civilizations constructed Dyson spheres, which disintegrated over time, their fragments could have given rise to the unusual shape and light sail characteristics of the interstellar object `Oumuamua.
Starting in 2025, we will be able to search for pieces of broken Dyson spheres with the Vera C. Rubin Observatory in Chile by employing its 3.2-billion-pixel camera to survey the southern sky every 4 days. In view of this new observatory, “the sky’s the limit,” as the popular saying goes.