Comment on Blue Origin has hot fired its BE-4 rocket engine for the first timeparentComments−fkfk8yThey are called shock diamonds and are caused by standing shock waves in the exhaust plume: https://en.wikipedia.org/wiki/Shock_diamond
Comments
They are called shock diamonds and are caused by standing shock waves in the exhaust plume: https://en.wikipedia.org/wiki/Shock_diamond