Developing reusable rocket stages in Europe is led by @esa and @ArianeGroup with Prometheus: a precursor for a methane-fuelled first stage, produced with 3D printing, to be used on future evolutions of @Ariane6 
Read more about the new low-cost engine: http://www.esa.int/Enabling_Support/Space_Transportation/ESA_moves_ahead_on_low-cost_reusable_rocket_engine …
Tomorrow is now. 
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