Scientists have observed a white dwarf star - a hot stellar remnant that is among the densest objects in the cosmos - that they have nicknamed Janus owing to the fact it has the peculiar distinction of being composed of hydrogen on one side and helium on the other.
Janus is fairly massive for a white dwarf, with a mass 20% larger than that of our sun compressed into an object with a diameter half that of Earth. It rotates on its axis every 15 minutes - very fast considering these stars usually rotate every few hours to a few days. The good news for Earthlings is that it should be 5 billion years before any of that happens to our sun.
Janus may represent a white dwarf in the midst of this transitional blending process, but with the puzzling development of one side being hydrogen while the other side is helium.
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