New Horizons data shows the solar wind slows 13% to 15% in the outer heliosphere as it picks up interstellar material. % Space looks empty until you try to cross it. Far beyond Pluto, where sunlight is faint and the planets are long behind, NASA’s New Horizons spacecraft is moving through a region where the Sun’s outflow begins to lose its grip. There, a stream of char... [8707 chars]
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