Changes

==History==

==History==

The first observation of the Omega nebula was made in 1745 by Jean-Philippe Loys de Chéseaux.<ref name=seds/> It was independently discovered by [[Charles Messier]] on 3^rd June 1764.<ref name=messier-objects/> [[William Herschel]]'s son, John, first noticed its resemblence to the letter omega. Admiral William Henry Smyth decided it appeared like a horseshoe and named it so in 1836.<ref name=messier-objects/>

The first observation of the Omega nebula was made in 1745 by Jean-Philippe Loys de Chéseaux.<ref name=seds/> It was independently discovered by [[Charles Messier]] on 3 June 1764.<ref name=messier-objects/> [[William Herschel]]'s son, John, first noticed its resemblance to the letter omega. Admiral William Henry Smyth decided it appeared like a horseshoe and named it so in 1836.<ref name=messier-objects/>

==Properties and Structure==

==Properties and Structure==

The nebula has a diameter of 15 light years and is part of a larger cloud that is at least 40 light years across.<ref name=messier-objects/> One of the larger H II (cloud of [[ionization|ionized]] [[hydrogen]]) in the galaxy, it is believed to have a [[mass (science)|mass]] of 800 solar masses. The [[open cluster]]  housed within the nebula of 35 stars which illuminate the cloud. The nebula itself contains at least 800 stars. The gas an dust present in the the nebula prevent event the brightest of these stars being visible.

The nebula has a diameter of 15 light years and is part of a larger cloud that is at least 40 light years across.<ref name=messier-objects/> One of the larger H II (cloud of [[ionization|ionized]] [[hydrogen]]) in the galaxy, it is believed to have a [[mass (science)|mass]] of 800 solar masses. The [[open cluster]]  housed within the nebula of 35 stars which illuminate the cloud. The nebula itself contains at least 800 stars. The gas an dust present in the nebula prevent event the brightest of these stars being visible.

==References==

==References==