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UC Irvine Finds Rocky GJ 3378 b Near Habitable Zone

7/11/2026

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Story summary
  • UC Irvine researchers published in The Astrophysics Journal that GJ 3378 b may be in its star’s habitable zone.
  • The planet orbits a star 25 light-years away, receives 91 % of Earth’s solar energy and is around 0 °C.
  • Revised data give it a mass 2.3 times Earth’s, indicating a rocky world.
  • NASA aims to launch Habitable Worlds Observatory in the 2040s, despite no atmosphere or liquid water being observed on the planet.