January 3 2011
The colossal, cross-constellational asterism known as the Winter Hexagon is shown here. This geometrical shape comprises the stars Capella, Aldebaran, Rigel, Sirius, Procyon, and Castor/Pollux. While this isn't as distinguishable to me as the Summer Triangle, it is impressive for such a large shape to exist naturally in the cosmos. This picture was taken in a relatively dark part of Colorado, but I think it would be even easier to recognize in a brighter area: even though the vertices would be darker, there would be fewer visible stars surrounding them.
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