Start of the Pioneer 4 probe

Start of the Pioneer 4 probe

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NASA successfully launched unmanned spacecraft Pioneer 4. It was the first US probe to escape Earth's gravity. The mission goal was a lunar flyby. It was only a partial success. The probe passed the Moon at a distance about 60,000 km. it was twice the planned distance. After the flyby, the Pioneer 4 entered a heliocentric orbit.

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