In today's image, we see the globular star cluster known as Omega Centauri. Globular star clusters exist in the spherical halo of our galaxy. Omega Centauri has an unusual combination of stellar populations leading astronomers to consider that it may be the core of a small galaxy which merged with the Milky Way in the past.

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This Podcast is an authorized New Media Mirror Site for APOD. You can access the image and website directly at: Astronomy Picture of the Day. You can use the archive link below the image to select the photo corresponding to the date of this podcast.

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