A study led by the University of Oxford has identified a new type of planet beyond our Solar System – one that stores large amounts of sulphur deep within a permanent ocean of magma. The magma ocean has lasted 5 billion years so far, while Earth's magma ocean likely lasted only tens of millions of years. Earth was once a magma ocean world, just as all rocky worlds were early in their development, according to theory. As the very young Earth cooled, only the outer core remained molten, wrapped around a solid inner core and covered by the solid mantle ... [5860 chars]
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