Circumstellar Disk Imaged

[extherian]

They'd discover ancient, non-sentient bots constructing pointless megastructures out of the dust, awaiting the time when their long-dead creators finally arrive on the scene to tell them that the job is done. Vast, worm-like machines composed of interlinked ring-shaped bots, composed of exotic ices, consuming dust and excreting bubble-shaped habitats and vehicles that eventually fall to pieces over the millennia.