NGC 6804 vs NGC 6772
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NGC 6804
NGC 6804 is a planetary nebula in the constellation Aquila. It has a ring-like bright inner shell and a much fainter, more extended outer halo, giving the object a layered appearance in deep images. William Herschel recorded the nebula in 1791. Like other planetary nebulae, it consists of gas expelled by a star during a late stage of stellar evolution, illuminated by the remaining hot central star...
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NGC 6772
NGC 6772 is a planetary nebula in the constellation Aquila. William Herschel recorded it in July 1784, and modern catalogues identify it as a faint, compact object with a roughly oval or ring-like appearance in images. Like other planetary nebulae, it is the glowing material expelled by an evolved star and illuminated after the star has left its red-giant phase, making it an observing target for a...
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