Visibility IV / V
I described the so-called from the constellation of the "easy" deep sky object, i.e. the open constellation M35 Gemini. In the lower right corner of the picture, a more distant constellation of NGC 2158 could be accommodated, with yellow stars attracting attention. You see, this star cluster is clearly older in time than the M35 in the foreground, where the blue young stars are still shining brightly. The bright blue stars of NGC 2158 have burned out over time and therefore disappeared from view.
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