actually, the HA blobs within M31 are nebulas that are IN m31. if you were in m31 and imaged those nebulas, those would be as big as orion, if not even bigger. hard to quantify its size from a photo.
This is an amazing and wonderful feat. Thanks to all of you and a special thanks for your continued mentoring to all of us. May all of your skies be clear, forever and a day.
Not bad. Still strange feel of some shenenigans, as low res picture atrifically stretched. Real spatial resolution way less than image resolution. Maybe it is atmosphere wobbling or some post processing 4x AI algorithm.