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APOD: 2021 April 18 - Rainbow Airglow over the Azores

"A spectacular sky is visible through this banded airglow, with the central band of our Milky Way Galaxy running up the image center, and M31, the Andromeda Galaxy, visible near the top left."

Source: apod.nasa.gov

airglow galaxy visible apod andromeda banded m31 band