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Helix in the Sky Tonight

Credit: Canada-France-Hawaii Telescope/Coelum
Wednesday, April 1, 2015: A sun-like star in the late white-dwarf stage of its life blows out a huge gas bubble that glows with colors stemming from the…Read More »





ultraviolet light of the star. Ionized hydrogen glows red, and towards the center, doubly ionized oxygen appears green.

— Tom Chao   Less «
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