In the middle you can see the central star that produced this nebula at the end of its life as a giant star and beginning of the new life as a white dwarf.
.
Image 2
Complete image of the planetary nebula NGC 2440.
Green is molecular hydrogen (F212N), blue is iron emission (F164N) and red is emission by hydrogen atoms (F405N). Orange for the F356W filter.
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Image 1
In the middle you can see the central star that produced this nebula at the end of its life as a giant star and beginning of the new life as a white dwarf.
.
Image 2
Complete image of the planetary nebula NGC 2440.
Green is molecular hydrogen (F212N), blue is iron emission (F164N) and red is emission by hydrogen atoms (F405N). Orange for the F356W filter.
From Melina Thévenot