Astronomers find a new planet that's mostly made of iron
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
An iron-rich planet spotted in a nearby solar system could help scientists understand the mystery of how the planet Mercury formed in our own neighborhood.
The newly-described planet is about 31 light years away, according to a in the journal . Astronomers haven't seen it directly, but they've been able to estimate its size and mass by watching its effects
