The constellation Gemini (the Twins). In the top left of the frame are Castor (upper) and Pollux (lower), whilst Alhena appears near the bottom right. Pollux is the brightest of these, and is an orange supergiant 35 light years away. Castor is a white multiple star 46.2 light years distant from Earth. The images of the stars in Gemini have been enhanced by a photographic technique.