Deutsch: CALLISTO (Cooperative Action Leading to Launcher Innovation in Stage Toss back Operations) ist ein wiederverwendbarer Demonstrator für eine vertikal startende und vertikal landende Raketenstufe (VTVL). Das deutsch-französisch-japanische Projekt von DLR, CNES und JAXA zielt darauf ab, die Kenntnis über VTVL-Raketenstufen zu verbessern.
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