Over the past six decades, 12 people have walked on the moon, spacecraft have visited every planet from Mercury to Neptune, and four rovers have racked up more than 60 kilometers traveling on the surface of Mars. And yet, despite the billions of dollars spent on the world’s civilian space programs, never has a probe journeyed very close to the sun. The nearest approach, by the Helios B probe in 1976, came no closer than 43 million km.
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