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Astronomy Picture of the Day

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@nasa_apod

Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. provided by NASA and Michigan Technological University (MTU).
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Astronomy Picture of the Day
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MarsNorthPole_MarsExpress_960.jpg

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Astronomy Picture of the Day
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🌌The Spiral North Pole of Mars Why is there a spiral around the North Pole of Mars? Each winter this pole develops a new outer layer about one meter thick composed of carbon dioxide frozen out of the thin Martian atmosphere. This fresh layer is deposited on a water-ice layer that exists year round. Strong winds blow down from above the cap's center and swirl due to the spin of the red planet -- ...