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The Earth seen from the International Space Station on April 3, 2026. Photo: NASA/Chris Williams

NASA's decision to order International Space Station astronauts to prep for a hasty departure Friday was the latest — and most dramatic — episode in a years-long saga tied to mysterious leaks in a Russian module.

Why it matters: The ISS is nearing the end of its expected lifespan, but it's still invaluable for America's crewed spaceflight and scientific ambitions.