While it's not fully proven that it is the case, the prevailing theory for the manifestation of an Index is that it is contingent on someone transcending and becoming a Monolith on a world or near it's WayHall to make the Index appear. Even that theory is spotty, because it is hard enough to find an Index, let alone detect when its anomalous rift first appeared.
The only way to determine if the Index has appeared anywhere is by looking at the dark side of a WayPoint. If the surface is placid, the Index is still missing. If it emits a slight vibration, the Index has manifested somewhere near to a Monolith.
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