From a research center in Germany, a team of aerospace engineers has quietly proposed an alternative vision for the future of spaceflight — one that challenges not just SpaceX's rocket, but its entire philosophy of how to return a booster to Earth. The RLV C5 concept, unveiled in May 2025, imagines a winged, hydrogen-fueled giant that glides home rather than hovers, claiming dramatic gains in payload efficiency. Whether this represents a genuine fork in the road of human spacefaring, or simply a well-reasoned sketch that history will leave unbuilt, depends on whether Europe can summon the will