Castor and Pollux, Not Really Twins

(Syfy Wire::Bad Astronomy) – Phil Plait:

If you live in the northern hemisphere – and statistically speaking, there’s a 90% chance you do – then go outside and look south as soon as the sky gets dark. You’ll see Orion standing tall to the southwest, leaning a bit to his left (your right, since we assume he’s facing us), with the bright star Sirius to the lower left, and Procyon directly left of reddish Betelgeuse (Orion’s right shoulder – to your left).

Just above Procyon are two more bright stars, close together in the sky. These are Castor and Pollux, and they mark the heads of the twin brothers denoted by the constellation Gemini. If you have good eyesight you may be able to tell that Pollux (the one closer to the eastern horizon) is yellowish, while Castor is blue. …

blastr red-star-blue-star

Gemini, by Rogelio Bernal Andreo

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