Gemini

Discover amazing facts about Gemini, the twin constellation with two bright stars representing the mythological brothers Castor and Pollux


Gemini shows two parallel lines of stars representing the twin brothers Castor and Pollux
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Gemini shows two parallel lines of stars representing the twin brothers Castor and Pollux

ILLUSTRATION BY Kevin M. Gill

Gemini the Twins is a wonderful winter constellation that shows two people standing side by side in the sky! The constellation is easy to recognize because it consists of two roughly parallel lines of stars, with the bright stars Castor and Pollux marking the heads of the twins. These two stars are almost equally bright and sit close together, making them perfect representatives of twin brothers. Gemini sits right next to Orion in the winter sky, making it easy to find when Orion is visible.

According to Greek mythology, Castor and Pollux were twin brothers (though they had different fathers!) who were known for their bravery and adventures. They sailed with Jason and the Argonauts in search of the Golden Fleece and were eventually placed in the sky as a reward for their heroic deeds. Gemini is also one of the twelve zodiac constellations, which means the Sun travels through it each year during late May and June. The constellation contains several interesting deep-sky objects, including beautiful star clusters that are fun to explore with binoculars.

GEMINI QUICK FACTS
BEST VIEWING: Winter evenings (December through March)
BRIGHT STARS: Castor and Pollux (the twin's heads)
SHAPE: Two parallel lines of stars
MYTHOLOGY: Twin brothers from Greek legends
ZODIAC SIGN: Sun passes through Gemini in late May and June
LOCATION: Next to Orion in the winter sky

AMAZING GEMINI FACTS
Castor is actually a complex system of six stars orbiting each other, while Pollux is an orange giant star
Gemini contains M35, a beautiful star cluster with about 400 stars that you can see with binoculars