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L 98-59 d has a thick hydrogen-rich atmosphere and even a global magma ocean beneath its surface. Pretty wild!
Its air contains hydrogen sulfide from volcanic activity, which gets turned into sulfur dioxide by starlight.
The magma ocean helps keep these gasses around over long periods of time, despite harsh space conditions.

This planet likely began as a larger sub-Neptune, but lost some of its atmosphere over time.
Now, it is being called a "volatile-rich super-Earth," a whole new class that does not fit the usual rocky or watery categories.
It is changing how scientists think about what planets can be like out there.