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Venus's surface is shrouded in mystery thanks to its ultra-thick atmosphere, but when the Pioneer Venus Orbiter reached orbit 44 years ago on Dec. 4, 1978, it sent back detailed data about the planet…for another 14 years!

More about the mission: https://go.nasa.gov/3H4FI4A
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In Depth | Pioneer Venus 1 – 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
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