How do astronomer determine the temperature of a black dwarf star?
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Within this nebula, the hot core of the star remains—crushed to high density by gravity—as a white dwarf with temperatures over 180,000 degrees Fahrenheit (100,000 degrees Celsius). Eventually—over tens or even hundreds of billions of years—a white dwarf cools until it becomes a black dwarf, which emits no energy
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It can be calculated by using the LASER(Light amplification by stimulated emission of radiation) method.
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