Voyager 1 mit der Geschwindigkeit, mit der sie sich im Jahr bis 2026-10-25 nach außen bewegte (JPL Horizons). Fahrt: ohne Pause, ohne je nachzutanken.
Wie er entdeckt wurde
Erster Planet, entdeckt 2010 durch Transit (NASA Exoplanet Archive).
Seine Planeten
Kepler-9 b — 8.3 times Earth's width, Neptune-sized; its year lasts 19 days; about 390 °C, hotter than boiling water; found in 2010 by transit.
Kepler-9 c — 8.1 times Earth's width, Neptune-sized; its year lasts 39 days; about 250 °C, hotter than boiling water; found in 2010 by transit.
Kepler-9 d — 1.6 times Earth's width, a 'sub-Neptune' — bigger than Earth, smaller than Neptune; its year lasts 38 hours; about 1,800 °C, hot enough to melt rock; found in 2010 by transit.
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.