55 Cancri e, Janssen

EXOPLANET · the lava world

YEAR 18 hoursSURFACE likely a global lava ocean

A super Earth so close to its star that its year lasts 18 hours and its day side is probably one endless ocean of molten rock. Some scientists once speculated its interior might be rich in carbon, inspiring the headline of a diamond planet. Whatever it is made of, Janssen is a vision of rock pushed past every limit.

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