Open Star Clusters M35 and NGC 2158 . ... Credit Copyright: Canada-France-Hawaii Telescope , J.-C. Cuillandre ( CFHT ), Coelum Explanation: Open clusters of stars can be near or far, young or old, and diffuse or compact. ... NGC 2158 's bright blue stars have self-destructed , leaving cluster light to be dominated by older and yellower star s. Both clusters are visible toward the constellation of Gemini -- M35 with binoculars and NGC 2158 with a small telescope. ...