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→Properties and Structure: Spelling, Grammar, and General Cleanup, typos fixed: is is → is
==Properties and Structure==
==Properties and Structure==
At 35° across, the Gum nebula is by far the largest emission nebula known and covers an area of sky several times that of the [[Moon]]. It's distance of some 1,300 [[light year]]s means that is is roughly 1,000 light years across.<ref name=britannica/> The radiation emitted by two stars located within the nebula, ζ Puppis and γ<sup>2</sup> Velorum, caused the [[hydrogen]] [[gas]] in the nebula to glow.<ref name=mitra/> The gas in the nebula has a [[density]] of around 2 particles cm<sup>-3</sup>.<ref name=mitra/>
At 35° across, the Gum nebula is by far the largest emission nebula known and covers an area of sky several times that of the [[Moon]]. It's distance of some 1,300 [[light year]]s means that is roughly 1,000 light years across.<ref name=britannica/> The radiation emitted by two stars located within the nebula, ζ Puppis and γ<sup>2</sup> Velorum, caused the [[hydrogen]] [[gas]] in the nebula to glow.<ref name=mitra/> The gas in the nebula has a [[density]] of around 2 particles cm<sup>−3</sup>.<ref name=mitra/>
==References==
==References==