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NGC objects / Spiral galaxies / Planetary science / Unbarred spiral galaxies / Nebula / Formation and evolution of the Solar System / Galaxy / Planetary nebula / Celestia / Astronomy / Space / Messier objects


6 · Explosive and Whirling Nebulæ ne of the most surprising triumphs of celestial O photography was Professor Keeler’s discovery, in 1899, that the great majority of the nebulæ have
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Document Date: 2003-03-17 16:40:22


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