Astronomy Picture of the Day

Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.

2023 November 13
The night sky over a snowy mountain is shown, with the
dark sky dominated by a large spiral galaxy -- the Andromeda
galaxy.
Please see the explanation for more detailed information.

Andromeda over the Alps
Image Credit & Copyright: Dzmitry Kananovich

Explanation: Have you ever seen the Andromeda galaxy? Although M31 appears as a faint and fuzzy blob to the unaided eye, the light you see will be over two million years old, making it likely the oldest light you ever will see directly. The featured image captured Andromeda just before it set behind the Swiss Alps early last year. As cool as it may be to see this neighbouring galaxy to our Milky Way with your own eyes, long duration camera exposures can pick up many faint and breathtaking details. The image is composite of foreground and background images taken consecutively with the same camera and from the same location. Recent data indicate that our Milky Way Galaxy will collide and coalesce with Andromeda galaxy in a few billion years.

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Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (UMCP)
NASA Official: Phillip Newman Specific rights apply.
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