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Solar Probe+ will be an
extraordinary and historic mission, exploring what is arguably the
last region of the solar system to be visited by a spacecraft, the
Sun�s outer atmosphere or corona as it extends out into space.
Approaching as close as 9.5 solar radii* (8.5 solar radii above
the Sun�s surface), Solar Probe+ will repeatedly sample the
near-Sun environment, revolutionizing our knowledge and
understanding of coronal heating and of the origin and evolution
of the solar wind and answering critical questions in heliophysics
that have been ranked as top priorities for decades. Moreover, by
making direct, in-situ measurements of the region where some of
the most hazardous solar energetic particles are energized, Solar
Probe+ will make a fundamental contribution to our ability to
characterize and forecast the radiation environment in which
future space explorers will work and live.
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