Faint blue arcs stretch across the sky near Andromeda. But they aren’t part of that galaxy.

SDSO 1 is now recognized as a Ghost Planetary Nebula, a newly defined class. It belongs to our own Milky Way.

Discovered by amateurs. Confirmed with 550 hours of data.

📅 Aug 4, 2025
📷 Patrick Ogle et al.
#SDSO1 #PlanetaryNebula #Andromeda #DeepSky #Astrophotography #StellarSnap