🚀 Solid or liquid? There are two main types of propulsion for sending rockets into space. ArianeGroup engineers explain the different technologies used by the group on Ariane 6: 🔹 Solid propulsion : Just like a firework! After it’s ignited combustion continues until the fuel is used up. What’s the advantage? Instantaneous thrust, in practically any conditions. 🔹 Liquid propulsion : More flexible. Mixing liquid fuels like hydrogen, oxygen and methane produces a controlled thrust that can be ad