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Frontier planets or Frontier worlds were planets on the edge of Federation space, or beyond its control.

Frontier planets had a lower level of facilities compared to other planets with the Federation, with more primitive medicate facilities. (A: Orac)

Federation uses[]

Frontier worlds were used by the Federation as destinations to send deserters, whereupon they would be placed in slavery. (A: Deliverance). Or in the case of planets annexed by the Federation much of their population was sent to frontier planets. (A: Time Squad)