Open Clusters M35 and NGC 2158 are seen here in the constellation of Gemini. M35 is a spectacular large open cluster containing about 200 stars located in Gemini about 2,800 light years from us. In this image it takes up most of the top left of the frame. Shining at magnitude 5 and with an apparent size as large as the full Moon at 30 arc minutes, it is visible to the unaided eye as a diffuse object off the foot of Gemini. M35 is a relatively young cluster estimated to be about 150 million years old. It is accompanied by a golden jewel-like smaller companion, open cluster NGC 2158, located about 15 arc minutes to the southwest of M35. It is seen at the lower right of the photo. NGC 2158 contains more stars and is more compact than M35. It shines at about magnitude 8.6 and is about 5 arc minutes in angular diameter. It is located 4 or 5 times more distant than M35 and is estimated to be about 1 to 1.5 billion years old. At this age, most of the hot blue stars are gone, leaving only older yellow stars.