Stars that stop cooling for over eight billion years could have implications for galaxy dating
While Earth’s hydrogen-burning sun currently powers its luminosity with nuclear fusion, at some point – like all celestial sparks that dot the skies – it will run out of fuel and eventually turn into a white dwarf star.
But a new study co-authored by Blouin in the scientific journal ‘Nature’ revealed a population of white dwarfs that stopped cooling for more than eight billion years. Typical white dwarfs cool to a point where they form crystals, causing them to become increasingly solid as they freeze from the inside out.
Aside from the study challenging the standard definition of white dwarfs being dead, it also has implications for “galactic archaeology.” While there are still unknowns, the researchers suspect the newly discovered behaviour is spurred by a white dwarf colliding with another star, which causes them to merge into a bigger celestial body.
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