About image
M 35 (near the center of the image) and NGC 2158 (on the right) make up a nice pair of open clusters in the constellation Gemini.
M35 apparently measures about 30' and contains about 200 components included between magnitudes 8.3 and 13.
The distance has been estimated in about 2800 light years, which is equivalent to a real size of about 24 light-years in diameter; the age was instead indicated for 110 million years.
NGC 2158, on the other hand, is a much weaker cluster due to the greater distance at which it is located, more than 16,000 light years: therefore it also appears strongly obscured by interstellar dust that is interposed along the line of sight.