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The Greta rocket engine has completed its first test campaign, achieving multiple ignitions between July and November 2025. This 5 kN thrust class engine, developed under the European Space Agency's Future Launchers Preparatory Programme, can be utilized for lunar landers and larger kick stages such as the Ariane 6 add-on Astris.

Utilizing hydrogen peroxide and ethanol as propellants, Greta presents a sustainable alternative to traditional monomethyl hydrazine engines. The tests confirmed stable operations, including controlled shutdowns, with continuous firings lasting over 40 seconds.