If Nibiru orbited along such an elliptical orbit that it was nearly aways beyond the solar system, only entering for a few short years, then how can it be inhabited by a race of killer slaving aliens? In the outer reaches of the solar system, the temperature rarely rises above -200 degrees Celsius (-328 F). At those temperature, even simple organisms die, so those aliens couldn't grow crops, there would be no light (the sun would be but a distant speck) and their world would be frozen to the core.
How can they survive such inhospitable conditions?
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