Veil nebula, a supernova remnant in Cygnus, here in its entirety, from the eastern arc at left, catalogued as NGC 6992/5, to the western arc at right, NGC 6960, running past the star 52 Cygni. At top is the wedge-shaped Pickering's Triangle. The field is filled with lots of little nebula, all of which are the remains of a star that exploded as a supernova some 10, 000 to 20, 000 years ago and located about 2, 400 light years away. The red is emission from ionized hydrogen, the cyan emission from ionized oxygen. This nebula shows a lot of oxygen emission at the leading edge of the expanding cloud of debris. |