
A protoplanetary disk

A protoplanetary disk in the interstellar view
A proto-planetary disk is a system with a single star at its center and no planets around it, instead having a disk of dust and gas. They are rarer than black holes, having very few in the galactic arms and even less near the Galactic Core. Proto-planetary disks serve no gameplay purpose, besides completing the collection.
There is an in-game error where the player will sometimes receive the "Black Hole" item in the collection of "Galactic Objects" instead of the "Proto-Planetary Disk".
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