Impression of the 6.9 minute double white dwarf binary J1539+5027, composed of a tidally heated white dwarf (yellow) and its more compact companion (blue). It is about to start mass transferring. Credit: KyotoU / Lucy McNeill, edited White dwarfs are the dense remnants left behind after a star stops producing energy through nuclear fusion, a stage our own sun will reach far in the future. These stellar remnants behave in unusual ways, since their internal structure makes them shrink as they

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