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→Properties and Structure: Spelling, Grammar, and flow, typos fixed: is is → is
==Properties and Structure==
==Properties and Structure==
The nebula's great distance of 160,000 [[light year]]s means that its apparent size of some 40 x 25 arcminutes corresponds to a size of 550 to 1,000 light years across.<ref name=britannica/><ref>[https://apod.nasa.gov/apod/ap171116.html The Tarantula Nebula ] from apod.nasa.gov</ref> This makes it the largest nebula in the [[Local Group]], the collection of [[galaxies]] surrounding the [[Milky Way]] including the [[Andromeda galaxy]].<ref name=constellation-guide/> The nebula is an [[emission nebula]], meaning that is is a gigantic cloud of [[ionization|ionized]] [[hydrogen]] [[gas]]. The [[ultraviolet]] radiation emitted by the stars ionizes the enveloping hydrogen gas causing it to glow. The mass of the nebula is thought to be on the order of 1,000,000 times that of the [[Sun]].<ref name=britannica/>
The nebula's great distance of 160,000 [[light year]]s means that its apparent size of some 40 x 25 arcminutes corresponds to a size of 550 to 1,000 light years across.<ref name=britannica/><ref>[https://apod.nasa.gov/apod/ap171116.html The Tarantula Nebula ] from apod.nasa.gov</ref> This makes it the largest nebula in the [[Local Group]], the collection of [[galaxies]] surrounding the [[Milky Way]] including the [[Andromeda galaxy]].<ref name=constellation-guide/> The nebula is an [[emission nebula]], meaning that is a gigantic cloud of [[ionization|ionized]] [[hydrogen]] [[gas]]. The [[ultraviolet]] radiation emitted by the stars ionizes the enveloping hydrogen gas causing it to glow. The mass of the nebula is thought to be on the order of 1,000,000 times that of the [[Sun]].<ref name=britannica/>
Other objects of interest within the nebula include the supernova remnant NGC 2060, which was discovered by [[John Herschel]] in 1836. More recently in 1998, a [[pulsar]] was observed. Catalogued as PSR J0537-6910, the pulsar has a period of 18 ms (milliseconds).<ref name=constellation-guide/>
Other objects of interest within the nebula include the supernova remnant NGC 2060, which was discovered by [[John Herschel]] in 1836. More recently in 1998, a [[pulsar]] was observed. Catalogued as PSR J0537-6910, the pulsar has a period of 18 ms (milliseconds).<ref name=constellation-guide/>