Ariane 6
Ariane 6 is a European expendable launch system currently under development by ArianeGroup on behalf of the European Space Agency (ESA). It is intended to replace the Ariane 5, as part of the Ariane launch vehicle family.
Ariane 6 is designed with two core stages both powered by liquid hydrogen-liquid oxygen (hydrolox) engines. The first stage has an improved version of the Vulcain engine already used on the Ariane 5, whilst the second stage has a newly-designed Vinci engine. Most of the initial lift-off thrust is provided by solid rocket boosters attached to the first stage: either two or four P120s (Ariane 62 and Ariane 64 variants respectively), which are larger versions of the P80s used on the Vega rocket.