1.(Astronomy) the second brightest star, Alpha Geminorum, in the constellation Gemini: a multiple star consisting of six components lying close to the star Pollux. Distance: 52 light years 2.(Classical Myth & Legend)classical mythSeeCastor and Pollux ...
Castor, multiple star having six component stars, in the zodiacal constellation Gemini. The stars Castor and Pollux are named for the twins of Greek mythology. (List of Brightest Stars as Seen from Earth) Castor’s combined apparent visual magnitude is 1