Relativity Space, a Los Angeles orbital launch startup, has just released a short video showing its innovative Aeon 1 3D printed rocket engine in action. The impressive piece of equipment consists of just three 3D printed parts and is capable of reaching full thrust force in milliseconds. We’ve known for awhile that Relativity Space was working on some pretty cool stuff. This past October, for instance, the company announced the development of the Stargate 3D printer, which it says it the largest metal 3D printing system in the world. The machine, which consists of multiple laser-equipped Kuka robotic arms and...