Scientists have discovered a new relationship between the temperature and size of white dwarfs. The hotter they are, the puffier their outer layers appear to be. This finding could help us understand the nature of dark matter.
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White dwarfs are giving up more of their secrets, with the discovery that the hotter they are, the puffier their outer layers are. While this finding may sound immaterial, understanding the structure of white dwarfs could ultimately prove key in discovering what mysterious dark matter is made from. White dwarfs are like stars that have used up all their usable nuclear fuel. In five billion years' time, our sun will turn into a white dwarf after its phase. The sun's outer layers will be cast away into deep space, revealing its pearlescent core. White dwarfs can pack the mass of a star into a volume the size of , meaning they are extremely dense — a tablespoon of white dwarf material can weigh tons. Their interiors push physics to the extreme, but theory can make predictions about white dwarfs depending upon their mass and temperature. White dwarfs are born hot, often in the region of about 180,000 degrees Fahrenheit (100,000 degrees Celsius), although some have been found even hotter. That they're so hot is not surprising — they are the extinguished core of a star, after all, and have undergone gravitational contraction when they stopped producing energy. They then begin the slow process of cooling down over time. (Neutron stars are another type of stellar remnant. Neutron stars are formed when stars with more mass, are able to override electron degeneracy pressure, forcing electrons and protons to merge to form neutrons, and hence neutron stars are governed by neutron degeneracy pressure.) So that determines a white dwarf's minimum size, while their maximum size depends on their mass (the more massive, the larger they are) and their temperature
WHITE DWARFS DARK MATTER STELLAR REMNANTS TEMPERATURE DENSITY
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