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Planetary Nebulae Click icon to view a planetary nebula from Messier's catalog Messier's Planetary Nebulae; Links The icon shows the Helix Nebula NGC 7293, the nearest planetary nebula. When a star like our Sun comes to age, having longly burned away all the hydrogene to helium in its core in its main sequence phase, and also (in the consequent red giant stadium), the helium to carbon and ...
www.seds.org/messier/planetar.html
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