In today's image, we see the Orion Nebula below. This is an emission nebula showing the red glow of hydrogen gas which has been excited. Above is the Running Man Nebula which has a blue color and is a reflection nebula where dust preferentially scatters the blue light from hot stars.

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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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