Gemini (constellation)

Gemini is a constellation in the northern sky representing the mythological twin brothers Castor and Pollux, and it's one of the twelve zodiac constellations that the Sun appears to pass through during the year. The two brightest stars in Gemini, also named Castor and Pollux, are easily visible to the naked eye and serve as helpful landmarks for stargazers navigating the winter night sky. Astronomers and space agencies have long studied this region because it contains interesting stellar objects, including the famous Gemini Nebula and various binary star systems where two stars orbit each other.