Shapley 1: An Annular Planetary Nebula

Wednesday, March 4, 2026 All day

What’s looking back at you isn’t a cosmic eye, but Shapley 1 , a beautifully symmetric planetary nebula . Shapley 1, also known as the Fine Ring Nebula or PLN 329+2.1 , bejewels the southern sky constellation of the Carpenter’s Square ( Norma ). The nebula is the result of a star near the mass of our Sun running out of fuel and shedding its outer layers . Glowing oxygen from those expelled layers makes up the circular halo. The bright central point is actually a binary: a white dwarf , the remaining stellar core after the outer layers are expelled into space, and another star, orbiting each other every 2.9 days. Shapley 1’s annular shape is due to our top-down view of the system and provides insight into the influence of central stars on planetary nebula structures . Image Credit & Copyright: Peter Bresseler ; Text: Keighley Rockcliffe ( NASA GSFC , UMBC CSST , CRESST II ) https://science.nasa.gov/image-article/apod-2026-march-4-shapley-1-an-annular-planetary-nebula/

Shapley 1: An Annular Planetary Nebula