An impressive sea creature in the constellation Centaurus. My image shows the ghostly remnant of a stellar explosion, often referred to as the “Mermaid Nebula.” What appears here as an elegant web of luminous blue filaments and red shock fronts is the brightest visible part of the much larger supernova remnant G296.5+10.0. An expanding field of debris left behind by a star that exploded about 14,000 years ago. Its extraordinary structure is striking. It is not a dense nebula, but a thin shell of stellar debris stretching out into space to form a delicate supernova remnant, twisted streams and translucent, oxygen-rich veils. The bright blue filaments indicate ionized oxygen, while the thin red edges reveal hydrogen emissions where the shock wave from the explosion is still colliding with the surrounding interstellar gas. The bright central arc is one of the most active visible sections of the shock front, while the fainter, detached strands show how fragile and diffuse the structure has become as the remnant continues to expand.