The Clouds of Andromeda

(Slate::Bad Astronomy) – Phil Plait:

The red clouds in the image around the Andromeda galaxy are hydrogen nebulae. They’re extremely faint; astrophotographer Rogelio Bernal Andreo had to work very hard to make them visible above the background light of the sky.

The big question is, what are those clouds? …

bad_astronomy 2017/01/12 diffuse_clouds

Rogelio Bernal Andreo: Clouds of Andromeda


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