The Eastern Veil Nebula or C33 is is a cloud of heated and ionized gas and dust in the constellation Cygnus. It constitutes the visible portions of the Cygnus Loop, a supernova remnant.
It has been determined to be about 2400 light-years distant from the earth and is based on direct astrometric measurements. The Veil Nebula is expanding at a velocity of about 1.5 million kilometres per hour. Using images taken by the Hubble Space Telescope between 1997 and 2015, the expansion of the Veil Nebula has been directly observed. The same telescope captured several images of the nebula. The analysis of the emissions from the nebula indicates the presence of oxygen, sulfur, and hydrogen. It is also a strong emitter of radio waves and x-rays.
In the image below with is a HOO colour pallet, the red is for Hydrogen and the blue is for Oxygen.
