... NGC 5189: An Unusually Complex Planetary Nebula . ... When a star like our Sun is dying, it will cast off its outer layers, usually into a simple overall shape. Sometimes this shape is a sphere, sometimes a double lobe, and sometimes a ring or a helix. ... NGC 922: Collisional Ring Galaxy . ... What is sure is that NGC 922 is a ring galaxy created by the collision of a large and small galaxy about 300 million years ago. ... Recorded near the shower's peak in the early hours of December.. ...