Episode Details

In today's image, we see an aurora from 2016 as seen over Sweden. The green color of the aurora is caused when charged particles from the Sun strike Earth's magnetic field and are funneled to the atmosphere near the north and south magnetic poles. They then excite oxygen atoms in Earth's upper atmosphere, causing the green glow.

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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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