Several successive missions aimed at scrutinizing nearby stars for signs of exoplanets orbiting them have yielded knowledge of a bewildering array of worlds. The latest entry into that catalog of the bizarre is Tahay, also known as Gliese 367b, which seems to be made of almost pure iron.
Metalhead: Earth-Sized Exoplanet ‘Made Mainly of Iron’ Likely Remnant Core of Much Larger World
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