Even for astronomy, this one is pretty weird:
Weird white dwarf is hydrogen on one side and helium on the other
Quote:
...astronomers discovered a very unusual example of a white dwarf: one which seems to have one side composed of hydrogen and the other side of helium. The two-faced white dwarf has been nicknamed Janus, after the Roman deity with two faces...
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I've seen something comparable in chemically-peculiar Ap stars, which can have abundance distributions across the surface due to magnetic fields. But white dwarfs are dead stars that have mostly settled down.