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January 23rd in Astronomy and Space Science
Discovery1930American astronomer Clyde Tombaugh takes the first of two photographic plates that would lead to the discovery of Pluto. The second plate would be taken six days later on January 29th, and they would be compared on February 18th.
Unmanned Spaceflight2003The last signal detection from the Pioneer 10 spacecraft. At the time of the transmission, Pioneer 10 was 12,267,025,340 km (7,622,376,174 miles) from the Sun.
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