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December 6th in Astronomy and Space Science
Astronomical Event1882A transit of Venus visible from Europe and Asia permits detailed measurements of the Earth-Sun distance. Estimates of the scale of the solar system are improved to an accuracy of ± 0.3%.
Unmanned Spaceflight1957US Navy attempts a satellite launch atop a Vanguard rocket. It looses thrust 2 seconds into the flight and explodes. The small satellite pops off the exploding rocket and rolls away. Newspapers refer to the satellite as "Kaputnik" and "Stayputnik".
Unmanned Spaceflight1958US launches the Pioneer 3 unmanned moon probe. It does not achieve sufficient velocity to escape the Earth's gravity, but does provide additional data about the Van Allan radiation belts.
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