#barchan

[fuckyeahfluiddynamics]

Changing Climes on Mars

China's Zhurong rover explored Utopia Planitia on Mars from May 2021 to December 2022. During that expedition, the rover uncovered evidence of a major shift in climate that took place some 400,000 years ago. (Image credit: NASA/JPL-Caltech/UArizona; research credit: J. Liu et al.; via Gizmodo)

[therealuniverse]

Martian Sand dune This lovely image shows a solitary sand dune on the surface of Mars (isn’t that just cool to say?). The frame is 789×592 m, so the dune is about 500 meters across.

The dune appears white because it is early spring in this portion of the northern hemisphere on Mars and the dune is mostly covered by CO2 frost. However, you can see active processes caught in this snapshot; some areas of the dune are darkening where the sun has begun to warm it, causing the CO2 to sublimate. This process takes place every year in Mars’s atmosphere; CO2 migrates from one polar cap to the other as the seasons change. The dune’s crescent shape is sculpted by the winds; they generally blow from the top left to the lower right in this shot. The dune itself is made up of dark sand, probably ground up by the actions of the polar ice caps. Much of northern Mars is covered by sand dunes, although they’re not always as isolated as this one. They appear dark because they’re probably made up of basalt; that’s the same lava type found in most of Mars’s crust, in this case ground up into finer particles by the ice. -JBB Image credit: NASA/JPL/Univ. of Arizona http://cosmicdiary.org/lfenton/2013/12/27/wintery-dune

[fuckyeahfluiddynamics]

Field of Dunes

Barchan dunes collide in this astronaut image of Brazil's southern coastline. Barchan (pronounced "bar-kahn") dunes are crescent-shaped; their tips point downwind into their direction of travel. (Image credit: NASA; via NASA Earth Observatory)

[goodbearblind]

Posted @withrepost • @geosteinmetz My ground crew wades up through a tannin-stained river in Lençóis Maranhenses, Brazil. During the rainy season, the hollows between the mobile dunes become lakes of fresh water, and the sands are cut by rivers flowing from the jungle to the sea. #paramotor #LencoisMaranhenses #barchan #aeolian https://www.instagram.com/p/B47Cz5Li9_A/?igshid=5pjzutznpr2b

[tecnomagzne-blog]

Space Photos of the Week: No, You’re Not Barchan Mad. Those Dunes Are Blue.

Space Photos of the Week: No, You’re Not Barchan Mad. Those Dunes Are Blue.

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Space is amazing, but there is something extra amazing about a picture of our home planet, especially one starring the moon. Italian astronaut Paolo Nespoli snapped this stunning image of our Earth and moon from the International Space Station last September. Our thin blue atmosphere is what stands out here—reminding us how fragile our place in space really is.

NASA’s Juno spacecraft…

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[connor-burrows]

"Tadrart stone castles" by arsenyy