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What is Helix Nebula made up of?
The Helix is a planetary nebula, the glowing gaseous envelope expelled by a dying, sun-like star. Helix nebula consists of two gaseous disks, how they are formed or which material is present in it.
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Nebula and its Colours [duplicate]
A Nebula boasts of Too Bright Awesome Colors that includes red, blue, green, orange, white, etc?
They're result of excitation of electrons.
Is there a clear explanation as in which Color is ...
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