The fluffy bit in re 90 is a snowflake, or more...

The fluffy bit in re 90 is a snowflake, or more accurately a frost flake. It is water cie crystals growing in situ on the whatever it is detector in re 90. The ice crystals come right out of the air, same process that grows snowflakes in clouds and frost in your freezer. Relative humidity and temperature are just right for frost formation. In fact, in a couple of months, a frost layer a meter thick is going to form and BURY phoenix. the frost is going to form right out of "thin" air, quite literally.