The Iris Nebula (NGC 7023 or Caldwell 4) – Deep Sky Videos
From DeepSkyVideos. Professor Mike Merrifield is back in the Caldwell Catalogue and this time we unexpectedly discuss why the sky is blue… More links and info in full description ↓↓↓ The Iris Nebula is also known as NGC 7023 and Caldwell 4. Mike Merrifield is an emeritus professor from the University of Nottingham. Caldwell Playlist:…
