Changes

===Pistol Star===

===Pistol Star===

The Pistol star, designated V4647 Sagittarii, is a blue hypergiant and a candidate [[variable star|luminous blue variable]] or cLVB.<ref name=constellation-guide/> Discovered by Don Figer in the 1990s it is one of the brightest known [[star]]s, specifically at least 10^6.6 times brighter than the [[Sun]].<ref name=constellation-guide/><ref name=arxiv/> For a comparison, it radiates the same amount of energy in 20 seconds as the Sun does in an entire year. This results in an extraordinarily strong stellar wind, some 10 billion times more powerful than is outputted by the Sun and travels at 95 km/s.<ref name=arxiv/> It must be observed in the [[infrared]] region of the [[electromagnetic spectrum]] due to interstellar dust surrounding the star. If it were not for the dust, it would appear as a fourth [[Star magnitude|magnitude]] star even though it is over 25,000 light years away.<ref name=nasa/>  

The [[Pistol star]], designated V4647 Sagittarii, is a blue hypergiant and a candidate [[variable star|luminous blue variable]] or cLVB.<ref name=constellation-guide/> Discovered by Don Figer in the 1990s it is one of the brightest known [[star]]s, specifically at least 10^6.6 times brighter than the [[Sun]].<ref name=constellation-guide/><ref name=arxiv/> For a comparison, it radiates the same amount of energy in 20 seconds as the Sun does in an entire year. This results in an extraordinarily strong stellar wind, some 10 billion times more powerful than is outputted by the Sun and travels at 95 km/s.<ref name=arxiv/> It must be observed in the [[infrared]] region of the [[electromagnetic spectrum]] due to interstellar dust surrounding the star. If it were not for the dust, it would appear as a fourth [[Star magnitude|magnitude]] star even though it is over 25,000 light years away.<ref name=nasa/>  

It is thought to weigh more than 100 [[solar mass]]es but may have been composed of more than 200 solar masses of material in the past, much of it ejected into the nebula.<ref name=nasa/> However estimates vary with some putting it lower at 26.5 solar masses.<ref name=constellation-guide/> Unsurprisingly, the star itself is physically very large; its [[radius]] is greater than the distance between the [[Earth]] and the Sun or 93 million miles.<ref>[https://www.nasa.gov/image-feature/the-pistol-nebula The Pistol Nebula] from nasa.gov</ref> The star possess a temperature of 11,800 k.<ref name=constellation-guide/>

It is thought to weigh more than 100 [[solar mass]]es but may have been composed of more than 200 solar masses of material in the past, much of it ejected into the nebula.<ref name=nasa/> However estimates vary with some putting it lower at 26.5 solar masses.<ref name=constellation-guide/> Unsurprisingly, the star itself is physically very large; its [[radius]] is greater than the distance between the [[Earth]] and the Sun or 93 million miles.<ref>[https://www.nasa.gov/image-feature/the-pistol-nebula The Pistol Nebula] from nasa.gov</ref> The star possess a temperature of 11,800 k.<ref name=constellation-guide/>