Today’s #sunspots as seen through an Hydrogen-alpha filter and a Baader AstroSolar film filter. Lots of detail, the #convection granules can be seen. They are typically 1500 km wide. #Astrodon#astrophotography
This fluid, seemingly at rest initially, turns out to be convecting as revealed by a #timelapse movie. #Evaporation cools the fluid at the surface, which makes it a bit heavier than the fluid below, thus #convection ensues, very slowly!
This fluid is #rheoscopic, easy to make at home using shaving cream.
Why "intake underneath, exhaust at the top" never became the standard among mainstream #hardware#manufacturers, after all these years, eludes me. #lifehacking