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According to the Thirteenth Doctor, orphan planet was a grading that meant that a planet had become too toxic for life, uninhabitable. In societies that let this happen, there was often a ruling elite that managed to evacuate, then signed off all responsibility for whatever they had left behind; all sentient life died and the planet was classified as orphan.
In a future after 2020, in a possible timeline, there were at least 55 orphan planets, being Orphan 55 a future Earth.[statement unclear] On this Earth, a spa known as Tranquility Spa was set up with a barrier surrounding it, making it look lush and lively. (TV: Orphan 55)