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ESA’s first Scout mission, HydroGNSS, was launched on 28 November 2025, marking a significant step in advancing global understanding of water availability and the effects of climate change on Earth’s water cycle.The two twin HydroGNSS satellites were carried into orbit aboard a SpaceX Falcon 9 rocket from the Vandenberg Space Force Base in California, US.Embracing the New Space concept, HydroGNSS is one of ESA’s new Scout missions being developed within the Earth Observation FutureEO programme.