Astronomers find a new planet that's mostly made of iron : c

NASA's TESS telescope finds a small, iron-rich planet which could help explain the origins of Mercury, the innermost planet in our solar system

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Germany , Berlin , German , Joshua Winn , German Aerospace Center , Princeton University , Institute Of Planetary Research , Kristine Lam , Planetary Research , James Webb Space Telescope , Johns Hopkins University Applied Physics , Carnegie Institution ,