Tuesday, 26 November 2019

astrophysics - What mechanism is responsible for the creation of these dunes on Comet 67P/Churyumov-Gerasimenko?



What mechanism is responsible for the creation of these dunes on Comet 67P/Churyumov-Gerasimenko?


The following high resolution picture from ESA's Rosetta mission shows the dunes:


picture of comet



At a distance of 7.8 km from the surface, the image scale is about 66.5 cm/pixel, so each 1024 x 1024 pixel frame is about 680 m across (although if we assume the furthest point away is an additional ~1 km further from the centre, the image scale is about 92 cm/pixel).



So the scale of the dunes is on the order of tens of meters along the crest. And each crest are probably just a few meters apart.




No comments:

Post a Comment

Understanding Stagnation point in pitot fluid

What is stagnation point in fluid mechanics. At the open end of the pitot tube the velocity of the fluid becomes zero.But that should result...