Mike Siniscalchi gave me permission to post his picture of One-Armed Spiral Galaxy NGC 4725:
The explanation on APOD starts off with:
"While most spiral galaxies, including our own Milky Way, have two or more spiral arms, NGC 4725 seems to have only one."
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Technorati tags: Astronomy, Astronomy Picture of the day, Mike Siniscalchi, NGC 4725
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