NHAS - Today in Astronomy History

New Hampshire Astronomical Society

January 23rd in Astronomy and Space Science

	1930	American 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 29^th, and they would be compared on February 18^th.
	2003	The 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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