Across billions of years, Mars has been quietly losing its breath to the sun — and new research from two spacecraft reveals the mechanism is not a slow bleed but a rhythmic, wave-driven unraveling. Scientists have identified enormous Kelvin-Helmholtz waves forming at the boundary of Mars' upper atmosphere, where the solar wind rolls across it much as wind rolls across an ocean, generating plasma clouds that carry the planet's air into space. The discovery, made possible by combining data from NASA's MAVEN orbiter and China's Tianwen-1 probe, offers a new lens through which to understand not on