In today's image, we see an emission nebula in the shape of a question mark. This is a star forming region mapped in the light of three specific elements: oxygen, hydrogen, and sulfur.
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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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