#tiling destruction :)

Melting in a Spin

The world’s largest iceberg A23a is spinning in a Taylor column off the Antarctic coast. This poster looks at a miniature version of the problem with a fluorescein-dyed ice slab slowly melting in water. On the left, the model iceberg is melting without rotating. The melt water stays close to the base until it forms a narrow, sinking plume. In the center, the ice rotates, which moves the detachment point outward. The wider plume is turbulent compared to the narrow, non-rotating one. At higher rotation speeds (right), the plume is even wider and more turbulent, causing the fastest melting rate. (Image credit: K. Perry and S. Morris [doi.org])

Estrellas tartésicas revisitadas.

What an #uncovered CT scanner #rotation looks like at full speed:

Truchetterie

→ Comment le barrage des Trois Gorges, le plus grand du monde, ralentit la rotation de la terre
https://www.transitionsenergies.com/barrage-des-trois-gorges-ralentit-rotation-terre/

« Mais l’impact sur la rotation de la terre du barrage des Trois Gorges est faible comparé à celui de la fonte des glaces du Groenland. [L]a perte de masse glaciaire au Groenland modifie 10 fois plus la longueur d’une journée que la première fois que le barrage des Trois Gorges a été rempli. »

On the road :)

The sun rotates the fastest at the equator, whereas the #rotation rate slows down at higher latitudes and is the slowest at the polar regions.

But a nearby sun-like star—V889 Herculis, some 115 light years away in the constellation of Hercules—rotates the fastest at a latitude of about 40 degrees, while both the equator and polar regions rotate more slowly.

Such a behavior has never been observed for any #star, and we have no idea what is going on.

#astronomy
https://phys.org/news/2024-07-astronomers-anomalies-star-v889-herculis.html