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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.
HD image: LINK 🛸
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👨🚀 How many people are in space right now? 👩🚀
12
| Name | Craft |
|---|---|
| Oleg Kononenko | ISS |
| Nikolai Chub | ISS |
| Tracy Caldwell Dyson | ISS |
| Matthew Dominick | ISS |
| Michael Barratt | ISS |
| Jeanette Epps | ISS |
| Alexander Grebenkin | ISS |
| Butch Wilmore | ISS |
| Sunita Williams | ISS |
| Li Guangsu | Tiangong |
| Li Cong | Tiangong |
| Ye Guangfu | Tiangong |