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Reference.org
Themis programme
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<p>The Themis programme is an ongoing <a href="/facts/European_Space_Agency/L8YRNV0C">European Space Agency</a> programme carried by prime contractor <a href="/facts/ArianeGroup/a63EAksI">ArianeGroup</a>, aiming to develop a prototype <a href="/facts/Reusable_launch_vehicle/j0WC10op">reusable</a> rocket <a href="/facts/First_stage_(rocketry)/WNrmgztj">first stage</a> and plans to conduct demonstration flights. The prototype rockets will also be called <i>Themis</i>. As of 2025, two prototypes are being developed: <i>Themis 1-Engine Hop</i> (T1H) and <i>Themis 1-Engine Evolution</i> (T1E). Later, a three-engine variant (T3) will be built. </p><p>Themis is expected to provide valuable information on the economic value of reusability for the European government space program and develop technologies for potential use on future European launch vehicles.[<i>non-primary source needed</i>] Themis will be powered by the ESA's <a href="/facts/Prometheus_(rocket_engine)/3pGY52Lu">Prometheus</a> rocket engine. Eventually, lessons learned with Themis' development will pave the way for developing the European reusable launcher <a href="/facts/Ariane_Next/YXvdrcNa">Ariane Next</a>, which should first fly in the 2030s. </p><p>Themis is distinct from a similar project <a href="/facts/CALLISTO/nP0aBuCQ">CALLISTO</a> under development by <a href="/facts/CNES/4eJbr1fQ">CNES</a>, <a href="/facts/German_Aerospace_Center/nIeKtKqd">DLR</a>, and <a href="/facts/JAXA/ofUpflgf">JAXA</a>. </p>