reflex motion due to the presence of a low-mass planet in a 5.1-year orbit; however, this was later shown to be an artifact of noise that affects the pulse times from Geminga rather than a genuine orbital effect. See also Gemini (Chinese astronomy) List of stars in Gemini References External links Spaceflight Now: 'Cannonball pulsar' seen flying across space ESA: Hipparcos pinpoints an amazing gamma-ray clock Gemini (constellation) Pulsars