Nothing is normal on Ceres — least of all its mud volcanoes.

In new research published in Nature Astronomy, a large team of astronomers has laid out a new view of the weirdest world in our solar system. It seems that Ceres has had a busy last few billion years — including random smatterings of volcanism, but of a type seen nowhere else in the solar system.

Ceres is the largest world in the asteroid belt, and is believed to be a remnant proto-planet, or the kind of small worlds that served as the building blocks of the planets we see today. There’s abundant evidence that Ceres may have once had an ocean that’s since frozen over, and the tantalizing clues to a geologically active history.

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