- They may be referred to as Remote System Objects (RSOs).
A planet is considered to be a world within a system that has cleared its orbital position of worldlets, planetoids and other debris. Trans-Neptunian objects (commonly referred to as TNOs) lie within the outer part of a system where this process either hasn't occurred or is still ongoing.
The Terra System
TNOs fall within two broad zones:
- Bodies having an orbital resonance with Neptune. These are generally referred to as Kuiper Main Belt objects.
- Scattered disc and detached objects.
Other Star Systems
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