…boldly going where no spacecraft had gone before!
Pioneer 10, the first spacecraft sent to the outer solar system, became the first to cross Neptune's orbit #40YearsAgo today!
More about Pioneer 10, a mission of firsts! https://go.nasa.gov/3X22bVQ
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In Depth | Pioneer 10 – NASA Solar System Exploration
NASA’s real-time science encyclopedia of deep space exploration. Our scientists and far-ranging robots explore the wild frontiers of our solar system.NASA Solar System Exploration