Voyager 1 at the speed it moved outward over the year to 2026-10-25 (JPL Horizons). Driving: nonstop, never refuelling.
Facts
GJ 876 c has an equilibrium temperature between −50 and +50 °C.
How it was found
First planet found in 1998, by radial velocity (NASA Exoplanet Archive).
Its planets
GJ 876 b — 13 times Earth's width (estimated from its mass, not measured), a giant, Jupiter-sized or more; its year lasts 61 days; about −82 °C, below freezing; found in 1998 by radial velocity.
GJ 876 e — 3.9 times Earth's width (estimated from its mass, not measured), a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 120 days; about −120 °C, below freezing; found in 2010 by radial velocity.
GJ 876 c — 14 times Earth's width (estimated from its mass, not measured), a giant, Jupiter-sized or more; its year lasts 30 days; about −31 °C, below freezing; found in 2000 by radial velocity.
GJ 876 d — 2.5 times Earth's width (estimated from its mass, not measured), a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 47 hours; about 330 °C, hotter than boiling water; found in 2005 by radial velocity.
NASA Exoplanet Archive, Planetary Systems Composite Parameters (fetched 2026-11-02). Composite values: where a planet's size or mass was not measured, the archive estimates it from the other.
This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with NASA under the Exoplanet Exploration Program.