First Discoveries: Gamma Cephei A b

An infographic depicting one of the first exoplanets discovered.
August 14, 2016
CreditJPL-Caltech
Language
  • english

The discovery of planet Gamma Cephei A b was proposed in 1987, and then withdrawn in 1992. But in 2003, new measurements confirmed that it really was a planet– a giant exoplanet about twice the size of Jupiter that takes 903 days to orbit a star 45 light-years away.