The above image showcases NGC 6992 and 6995, a bright, filamentary arc known as the Eastern Veil Nebula[2]. This structure is part of the larger Veil Nebula which is a supernova remnant in the constellation Cygnus the Swan[1,5]. It is the eastern most section of the expanding shell of ionized gas and dust from a massive star's explosion approximately 8,000 years ago[5]. NGC 6995 (The Bat Nebula) is located at the sothern end and is conected to the bright northern arc of NGC 6992. Together they constitute the eastern portion of the Veil Nebula complex. The very large Veil Nebula also extends westword and encompasses Pickering's Triangle (Adjacent to NGC 6974) and the Western Veil (NGC 6960, also called the Witch's Broom).
At an estimated distance of about 2,400 light-years from Earth[1,3], the entire Veil Nebula spans roughly 110 light-years in diameter[4], making it a prominent example of a middle-aged supernova remnant. As such, the Veil Nebula is ideal for studying shock wave physics and interstellar interactions[4].
In the high-resolution view, the nebula's delicate, rope-like filaments are prominently highlighted, curving gracefully from the lower left to the upper right against a backdrop of a myriad of background stars. The structures exhibit a striking contrast of deep red hues from ionized hydrogen (hydrogen alpha) and teal-blue tones from doubly ionized oxygen (OIII), revealing the dynamic shock fronts where the expanding remnant collides with surrounding interstellar medium. Fainter wisps and knots add depth and enhance the nebula's complex, lacework morphology.
The image was assembled from data acquired through five filters: narrowband hydrogen-alpha (Ha) and doubly ionized oxygen (OIII) to emphasize the emission from shock-ionized gases, combined with broadband red, green, and blue (RGB) filters in order to portray normalize stellar colors and enhanced subtle nebular details. The Ha emission (appearing as deep red) maps regions abundant in ionized hydrogen, while OIII (teal/blue) traces oxygen atoms excited by the supernova's shockwave. This HOO-RGB palette not only accentuates the remnant's glowing filaments but also preserves the natural appearance of foreground and background stars.