From Astronomy Picture of the Day for 10/1/22.

A time-lapse video of Comet C/2021 A1 (named Leonard) as it progressed on its trip through the inner solar system.

The video was taken by NASA’s Solar Terrestrial Relations Observatory-Ahead (STEREO-A) over ten days in December and processed in such a way as to highlight differences from one frame to another.

This clearly shows the comet’s tail being wagged as it is buffeted by the solar wind.

But it does remind me of films I have seen of spermatozoa swimming on their way to fertilising eggs.

The solar wind is of course not actually a sound wave but a stream of particles blown out from the Sun. However NASA’s solar probe has enabled scientists to translate the particles’ impacts and other data into sound. (The video feed is from Parker’s sideways viewing camera; if it pointed forward the Sun’s glare would destroy it.)

From You Tube via Astronomy Picture of the Day for 21/1/20.