Roasting marshmallow' exoplanet is so hot, it rains metal. How did it form?

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WASP-121b is like nothing in the solar system, raining liquid metal and being puffy like a marshmallow. The origins of these "toasted marshmallow" planets could be more complicated than thought.

Roasting marshmallow' exoplanet is so hot, it rains metal. How did it form? : Read more