I'm a huge fan of space sciences and space exploration. I really enjoy any space related video and specially the live rocket launches. Here is something different, but I find it cool. It's a terrestrial test of a Z40 rocket engine used for second stage propulsion.
Video description:
Avio successfully tested the Zefiro 40 (Z40) engine, the second stage propulsion system of the Vega C satellite launcher, an evolution of the current Vega launcher scheduled to lift off for its maiden flight in 2019. This is the first functional test required to qualify this new propulsion system. During the test all of the parameters were gathered to calculate the engine’s behaviour at conditions very close to what the Z40 will encounter in actual operation: ignition at about 50 km above the earth’s surface after separation of the first stage P120.
More info on Vega C rocket:
https://www.esa.int/Our_Activities/Space_Transportation/Launch_vehicles/Vega-C