The Veil Nebula is a cloud of heated ionized gas and dust in the constellation Cygnus, and make

TheVeil Nebula is a cloud of heated ionized gas and dust in the constellation Cygnus, and makes up the visible portion of the Cygnus Loop, a large but faint supernova remnant, which exploded 5,000-8,000 years ago. 

Image Credit: NASA,ESA,ESO