The "Veil Nebula" is a cloud of heated and ionized gas and dust in the constellation Cygnus. It constitutes the visible portions of the "Cygnus Loop" , a large but relatively faint supernova remnant. The source supernova exploded some 5,000 to 8,000 years ago, and the remnants have since expanded to cover an area roughly 3 degrees in diameter . The distance to the nebula is not precisely known, but Far Ultraviolet Spectroscopic Explorer data supports a distance of about 1,470 light-years.
The Hubble Space Telescope captured several images of the nebula. The analysis of the emissions from the nebula indicate the presence of oxygen, sulfur, and hydrogen. This is also one of the largest, brightest features in the x-ray sky.
In modern usage, the names "Veil Nebula", "Cirrus Nebula", and "Filamentary Nebula" generally refer to all the visible structure of the remnant, or even to the entire loop itself. The structure is so large that several NGC numbers were assigned to various arcs of the nebula. There are three main visual components:
"NGC 6974" and "NGC 6979" are luminous knots in a fainter patch of nebulosity on the northern rim between NGC 6992 and Pickering's Triangle.
The nebula was discovered on 1784 September 5 by William Herschel. He described the western end of the nebula as ""Extended; passes thro' 52 Cygni... near 2 degree in length"", and described the eastern end as ""Branching nebulosity... The following part divides into several streams uniting again towards the south.""
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