APOD on Nostr: **Astronomy Picture of the Day** 06 July 2025 **The Spiral North Pole of Mars** ...
**Astronomy Picture of the Day**
06 July 2025
**The Spiral North Pole of Mars**
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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 -- contributing to Planum Boreum's spiral structure. The featured image is a perspective mosaic generated in 2017 from numerous images taken by ESA's Mars Express and elevations extracted from the laser altimeter aboard NASA's Mars Global Surveyor mission.
#APOD #Galactic #Exploration #NASAInspires #Astroeducation
https://apod.nasa.gov/apod/ap250706.htmlPublished at
2025-07-06 04:06:30 GMTEvent JSON
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"content": "**Astronomy Picture of the Day**\n\n06 July 2025\n\n**The Spiral North Pole of Mars**\n\nhttps://apod.nasa.gov/apod/image/2507/MarsNorthPole_MarsExpress_960.jpg\n\n*Image creditor details unavailable via API. Visit linked page below for full info.*\n\nWhy 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 -- contributing to Planum Boreum's spiral structure. The featured image is a perspective mosaic generated in 2017 from numerous images taken by ESA's Mars Express and elevations extracted from the laser altimeter aboard NASA's Mars Global Surveyor mission.\n\n#APOD #Galactic #Exploration #NASAInspires #Astroeducation\n\nhttps://apod.nasa.gov/apod/ap250706.html\n",
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