Assertion: nebula's temperature | /r/HasProperty | about 10,000 k
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Source sentences:
text: The temperature of the nebular gas averages about 10,000 K, with a range of 8,000 K to 23,000 K, depending on the individual nebula, the location within the nebula, and the method used to derived the temperature (for example, observations of He I recombination lines tend to give lower temperatures than those derived from H I recombination lines).