https://wccftech.com/jeff-bezoss-rocket-company-shares-rare-glimpse-inside-a-lit-up-rocket-engine/

The BE-4 during a test in 2015.

Retail billionaire Jeff Bezos's aerospace firm Blue Origin has shared a new video of its BE-4 rocket engine. Blue Origin is one of three American companies developing large rockets as part of a consolidated effort to increase the tonnage shipped by the aerospace industry and offer private firms as well as the National Aeronautics and Space Administration (NASA) multiple options to launch satellites and other payloads both into space and to the Moon.